help/templates: use hanging indent for field list

Now that the field list indentation is computed automatically, we no
longer need to align all fields the same. Using a simple hanging
indent makes it easy to edit the text in an editor like Emacs, which
will automatically recognized the hang and keep it.

The fields are still output with no blank lines between them.

mercurial/help/templates.txt

@@ -1,117 +1,149 b''
 Mercurial allows you to customize output of commands through
 templates. You can either pass in a template from the command
 line, via the --template option, or select an existing
 template-style (--style).
 
 You can customize output for any "log-like" command: log,
 outgoing, incoming, tip, parents, heads and glog.
 
 Three styles are packaged with Mercurial: default (the style used
 when no explicit preference is passed), compact and changelog.
 Usage::
 
     $ hg log -r1 --style changelog
 
 A template is a piece of text, with markup to invoke variable
 expansion::
 
     $ hg log -r1 --template "{node}\n"
     b56ce7b07c52de7d5fd79fb89701ea538af65746
 
 Strings in curly braces are called keywords. The availability of
 keywords depends on the exact context of the templater. These
 keywords are usually available for templating a log-like command:
 
 :author:    String. The unmodified author of the changeset.
-:branches:  String. The name of the branch on which the changeset
-            was committed. Will be empty if the branch name was
-            default.
-:date:      Date information. The date when the changeset was
-            committed.
+
+:branches: String. The name of the branch on which the changeset was
+    committed. Will be empty if the branch name was default.
+
+:date: Date information. The date when the changeset was committed.
+
 :desc:      String. The text of the changeset description.
-:diffstat:  String. Statistics of changes with the following
-            format: "modified files: +added/-removed lines"
-:files:     List of strings. All files modified, added, or removed
-            by this changeset.
+
+:diffstat: String. Statistics of changes with the following format:
+    "modified files: +added/-removed lines"
+
+:files: List of strings. All files modified, added, or removed by this
+    changeset.
+
 :file_adds: List of strings. Files added by this changeset.
+
 :file_copies: List of strings. Files copied in this changeset with
             their sources.
+
 :file_copies_switch: List of strings. Like "file_copies" but displayed
             only if the --copied switch is set.
+
 :file_mods: List of strings. Files modified by this changeset.
+
 :file_dels: List of strings. Files removed by this changeset.
-:node:      String. The changeset identification hash, as a
-            40-character hexadecimal string.
+
+:node: String. The changeset identification hash, as a 40-character
+    hexadecimal string.
+
 :parents:   List of strings. The parents of the changeset.
-:rev:       Integer. The repository-local changeset revision
-            number.
-:tags:      List of strings. Any tags associated with the
-            changeset.
+
+:rev: Integer. The repository-local changeset revision number.
+
+:tags: List of strings. Any tags associated with the changeset.
+
 :latesttag: String. Most recent global tag in the ancestors of this
             changeset.
+
 :latesttagdistance: Integer. Longest path to the latest tag.
 
 The "date" keyword does not produce human-readable output. If you
 want to use a date in your output, you can use a filter to process
 it. Filters are functions which return a string based on the input
 variable. You can also use a chain of filters to get the desired
 output::
 
    $ hg tip --template "{date|isodate}\n"
    2008-08-21 18:22 +0000
 
 List of filters:
 
 :addbreaks:   Any text. Add an XHTML "<br />" tag before the end of
               every line except the last.
-:age:         Date. Returns a human-readable date/time difference
-              between the given date/time and the current
-              date/time.
-:basename:    Any text. Treats the text as a path, and returns the
-              last component of the path after splitting by the
-              path separator (ignoring trailing separators). For
-              example, "foo/bar/baz" becomes "baz" and "foo/bar//"
-              becomes "bar".
-:stripdir:    Treat the text as path and strip a directory level,
-              if possible. For example, "foo" and "foo/bar" becomes
-              "foo".
-:date:        Date. Returns a date in a Unix date format, including
-              the timezone: "Mon Sep 04 15:13:13 2006 0700".
-:domain:      Any text. Finds the first string that looks like an
-              email address, and extracts just the domain
-              component. Example: ``User <[e-mail]>`` becomes
-              ``example.com``.
-:email:       Any text. Extracts the first string that looks like
-              an email address. Example: ``User <[e-mail]>``
-              becomes ``[e-mail]``.
-:escape:      Any text. Replaces the special XML/XHTML characters
-              "&", "<" and ">" with XML entities.
+
+:age: Date. Returns a human-readable date/time difference between the
+    given date/time and the current date/time.
+
+:basename: Any text. Treats the text as a path, and returns the last
+    component of the path after splitting by the path separator
+    (ignoring trailing separators). For example, "foo/bar/baz" becomes
+    "baz" and "foo/bar//" becomes "bar".
+
+:stripdir: Treat the text as path and strip a directory level, if
+    possible. For example, "foo" and "foo/bar" becomes "foo".
+
+:date: Date. Returns a date in a Unix date format, including the
+    timezone: "Mon Sep 04 15:13:13 2006 0700".
+
+:domain: Any text. Finds the first string that looks like an email
+    address, and extracts just the domain component. Example: ``User
+    <[e-mail]>`` becomes ``example.com``.
+
+:email: Any text. Extracts the first string that looks like an email
+    address. Example: ``User <[e-mail]>`` becomes
+    ``[e-mail]``.
+
+:escape: Any text. Replaces the special XML/XHTML characters "&", "<"
+    and ">" with XML entities.
+
 :fill68:      Any text. Wraps the text to fit in 68 columns.
+
 :fill76:      Any text. Wraps the text to fit in 76 columns.
+
 :firstline:   Any text. Returns the first line of text.
+
 :nonempty:    Any text. Returns '(none)' if the string is empty.
-:hgdate:      Date. Returns the date as a pair of numbers:
-              "1157407993 25200" (Unix timestamp, timezone offset).
-:isodate:     Date. Returns the date in ISO 8601 format:
-              "2009-08-18 13:00 +0200".
+
+:hgdate: Date. Returns the date as a pair of numbers: "1157407993
+    25200" (Unix timestamp, timezone offset).
+
+:isodate: Date. Returns the date in ISO 8601 format: "2009-08-18 13:00
+    +0200".
+
 :isodatesec:  Date. Returns the date in ISO 8601 format, including
-              seconds: "2009-08-18 13:00:13 +0200". See also the
-              rfc3339date filter.
+    seconds: "2009-08-18 13:00:13 +0200". See also the rfc3339date
+    filter.
+
 :localdate:   Date. Converts a date to local date.
-:obfuscate:   Any text. Returns the input text rendered as a
-              sequence of XML entities.
+
+:obfuscate: Any text. Returns the input text rendered as a sequence of
+    XML entities.
+
 :person:      Any text. Returns the text before an email address.
-:rfc822date:  Date. Returns a date using the same format used in
-              email headers: "Tue, 18 Aug 2009 13:00:13 +0200".
+
+:rfc822date: Date. Returns a date using the same format used in email
+    headers: "Tue, 18 Aug 2009 13:00:13 +0200".
+
 :rfc3339date: Date. Returns a date using the Internet date format
               specified in RFC 3339: "2009-08-18T13:00:13+02:00".
-:short:       Changeset hash. Returns the short form of a changeset
-              hash, i.e. a 12-byte hexadecimal string.
+
+:short: Changeset hash. Returns the short form of a changeset hash,
+    i.e. a 12-byte hexadecimal string.
+
 :shortdate:   Date. Returns a date like "2006-09-18".
+
 :strip:       Any text. Strips all leading and trailing whitespace.
-:tabindent:   Any text. Returns the text, with every line except
-              the first starting with a tab character.
-:urlescape:   Any text. Escapes all "special" characters. For
-              example, "foo bar" becomes "foo%20bar".
-:user:        Any text. Returns the user portion of an email
-              address.
+
+:tabindent: Any text. Returns the text, with every line except the
+     first starting with a tab character.
+
+:urlescape: Any text. Escapes all "special" characters. For example,
+    "foo bar" becomes "foo%20bar".
+
+:user: Any text. Returns the user portion of an email address.