help/hgweb: add pointer to hgrc(5) location

mercurial/help/hgweb.txt

@@ -1,46 +1,47 b''
 Mercurial's internal web server, hgweb, can serve either a single
 repository, or a collection of them. In the latter case, a special
 configuration file can be used to specify the repository paths to use
 and global web configuration options.
 
 This file uses the same syntax as other Mercurial configuration files,
 but only the following sections are recognized:
 
   - web
   - paths
   - collections
 
 The ``web`` section can specify all the settings described in the web
-section of the hgrc documentation.
+section of the hgrc(5) documentation. See :hg:`help config` for
+information on where to find the manual page.
 
 The ``paths`` section provides mappings of physical repository
 paths to virtual ones. For instance::
 
   [paths]
   projects/a = /foo/bar
   projects/b = /baz/quux
   web/root = /real/root/*
   / = /real/root2/*
   virtual/root2 = /real/root2/**
 
 - The first two entries make two repositories in different directories
   appear under the same directory in the web interface
 - The third entry maps every Mercurial repository found in '/real/root'
   into 'web/root'. This format is preferred over the [collections] one,
   since using absolute paths as configuration keys is not supported on every
   platform (especially on Windows).
 - The fourth entry is a special case mapping all repositories in
   '/real/root2' in the root of the virtual directory.
 - The fifth entry recursively finds all repositories under the real
   root, and maps their relative paths under the virtual root.
 
 The ``collections`` section provides mappings of trees of physical
 repositories paths to virtual ones, though the paths syntax is generally
 preferred. For instance::
 
   [collections]
   /foo = /foo
 
 Here, the left side will be stripped off all repositories found in the
 right side. Thus ``/foo/bar`` and ``foo/quux/baz`` will be listed as
 ``bar`` and ``quux/baz`` respectively.