hgweb: fix error in docstring

Despite the subtle semantic difference, this sentence really meant to
say "overridden", not "overwritten".

mercurial/helptext/hgweb.txt

@@ -1,86 +1,86
 Mercurial's internal web server, hgweb, can serve either a single
 repository, or a tree of repositories. In the second case, repository
 paths and global options can be defined using a dedicated
 configuration file common to :hg:`serve`, ``hgweb.wsgi``,
 ``hgweb.cgi`` and ``hgweb.fcgi``.
 
 This file uses the same syntax as other Mercurial configuration files
 but recognizes only the following sections:
 
   - web
   - paths
   - collections
 
 The ``web`` options are thoroughly described in :hg:`help config`.
 
 The ``paths`` section maps URL paths to paths of repositories in the
 filesystem. hgweb will not expose the filesystem directly - only
 Mercurial repositories can be published and only according to the
 configuration.
 
 The left hand side is the path in the URL. Note that hgweb reserves
 subpaths like ``rev`` or ``file``, try using different names for
 nested repositories to avoid confusing effects.
 
 The right hand side is the path in the filesystem. If the specified
 path ends with ``*`` or ``**`` the filesystem will be searched
 recursively for repositories below that point.
 With ``*`` it will not recurse into the repositories it finds (except for
 ``.hg/patches``).
 With ``**`` it will also search inside repository working directories
 and possibly find subrepositories.
 
 In this example::
 
   [paths]
   /projects/a = /srv/tmprepos/a
   /projects/b = c:/repos/b
   / = /srv/repos/*
   /user/bob = /home/bob/repos/**
 
 - The first two entries make two repositories in different directories
   appear under the same directory in the web interface
 - The third entry will publish every Mercurial repository found in
   ``/srv/repos/``, for instance the repository ``/srv/repos/quux/``
   will appear as ``http://server/quux/``
 - The fourth entry will publish both ``http://server/user/bob/quux/``
   and ``http://server/user/bob/quux/testsubrepo/``
 
 The ``collections`` section is deprecated and has been superseded by
 ``paths``.
 
 URLs and Common Arguments
 =========================
 
 URLs under each repository have the form ``/{command}[/{arguments}]``
 where ``{command}`` represents the name of a command or handler and
 ``{arguments}`` represents any number of additional URL parameters
 to that command.
 
 The web server has a default style associated with it. Styles map to
 a collection of named templates. Each template is used to render a
 specific piece of data, such as a changeset or diff.
 
-The style for the current request can be overwritten two ways. First,
+The style for the current request can be overridden two ways. First,
 if ``{command}`` contains a hyphen (``-``), the text before the hyphen
 defines the style. For example, ``/atom-log`` will render the ``log``
 command handler with the ``atom`` style. The second way to set the
 style is with the ``style`` query string argument. For example,
 ``/log?style=atom``. The hyphenated URL parameter is preferred.
 
 Not all templates are available for all styles. Attempting to use
 a style that doesn't have all templates defined may result in an error
 rendering the page.
 
 Many commands take a ``{revision}`` URL parameter. This defines the
 changeset to operate on. This is commonly specified as the short,
 12 digit hexadecimal abbreviation for the full 40 character unique
 revision identifier. However, any value described by
 :hg:`help revisions` typically works.
 
 Commands and URLs
 =================
 
 The following web commands and their URLs are available:
 
   .. webcommandsmarker