minor #19322 [Security] Update request matcher doc (MrYamous)

This PR was squashed before being merged into the 7.0 branch.

Discussion
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[Security] Update request matcher doc

RequestMatcher class has been removed in 7.0 cf [code PR](symfony/symfony#47595)

Changing link and rewording according to new behaviour

Commits
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f32a8cf [Security] Update request matcher doc

Author: OskarStark

security/access_control.rst

@@ -19,10 +19,10 @@ things:
 1. Matching Options
 -------------------
 
-Symfony creates an instance of :class:`Symfony\\Component\\HttpFoundation\\RequestMatcher`
-for each ``access_control`` entry, which determines whether or not a given
-access control should be used on this request. The following ``access_control``
-options are used for matching:
+Symfony uses :class:`Symfony\\Component\\HttpFoundation\\ChainRequestMatcher` for
+each ``access_control`` entry, which determines which implementation of
+:class:`Symfony\\Component\\HttpFoundation\\RequestMatcherInterface` should be used
+on this request. The following ``access_control`` options are used for matching:
 
 * ``path``: a regular expression (without delimiters)
 * ``ip`` or ``ips``: netmasks are also supported (can be a comma-separated string)