hgignore.5: remove extra quotes

The so-called "unconstrained quotes" didn't really work, so I reverted
them to normal quotes. Tested with asciidoc version 8.2.7 and 8.4.5.

doc/hgignore.5.txt

@@ -1,92 +1,92 b''
 HGIGNORE(5)
 ===========
 Vadim Gelfer <[e-mail]>
 :man source: Mercurial
 :man manual: Mercurial Manual
 
 NAME
 ----
 hgignore - syntax for Mercurial ignore files
 
 SYNOPSIS
 --------
 
 The Mercurial system uses a file called `.hgignore` in the root
 directory of a repository to control its behavior when it finds files
 that it is not currently managing.
 
 DESCRIPTION
 -----------
 
 Mercurial ignores every unmanaged file that matches any pattern in an
 ignore file. The patterns in an ignore file do not apply to files
 managed by Mercurial. To control Mercurial's handling of files that it
 manages, see the hg(1) man page. Look for the "-I" and "-X" options.
 
 In addition, a Mercurial configuration file can point to a set of
 per-user or global ignore files. See the hgrc(5) man page for details
 of how to configure these files. Look for the "ignore" entry in the
 "ui" section.
 
 SYNTAX
 ------
 
 An ignore file is a plain text file consisting of a list of patterns,
-with one pattern per line. Empty lines are skipped. The "``#``" character
-is treated as a comment character, and the "``\``" character is treated as
+with one pattern per line. Empty lines are skipped. The "`#`" character
+is treated as a comment character, and the "`\`" character is treated as
 an escape character.
 
 Mercurial supports several pattern syntaxes. The default syntax used
 is Python/Perl-style regular expressions.
 
 To change the syntax used, use a line of the following form:
 
 syntax: NAME
 
 where NAME is one of the following:
 
 regexp::
   Regular expression, Python/Perl syntax.
 glob::
   Shell-style glob.
 
 The chosen syntax stays in effect when parsing all patterns that
 follow, until another syntax is selected.
 
 Neither glob nor regexp patterns are rooted. A glob-syntax pattern of
-the form "``*.c``" will match a file ending in "``.c``" in any directory, and
-a regexp pattern of the form "``\.c$``" will do the same. To root a regexp
-pattern, start it with "``^``".
+the form "`*.c`" will match a file ending in "`.c`" in any directory, and
+a regexp pattern of the form "`\.c$`" will do the same. To root a regexp
+pattern, start it with "`^`".
 
 EXAMPLE
 -------
 
 Here is an example ignore file.
 
   # use glob syntax.
   syntax: glob
 
   *.elc
   *.pyc
   *~
 
   # switch to regexp syntax.
   syntax: regexp
   ^\.pc/
 
 AUTHOR
 ------
 Vadim Gelfer <[e-mail]>
 
 Mercurial was written by Matt Mackall <[e-mail]>.
 
 SEE ALSO
 --------
 hg(1), hgrc(5)
 
 COPYING
 -------
 This manual page is copyright 2006 Vadim Gelfer.
 Mercurial is copyright 2005-2009 Matt Mackall.
 Free use of this software is granted under the terms of the GNU General
 Public License (GPL).