minor symfony#15381 fix readlink description (a1812)

This PR was merged into the 4.4 branch.

Discussion
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fix readlink description

remove description readlink() for Windows misleading
see symfony/symfony#40866

Commits
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a2dd7ee fix readlink description

components/filesystem.rst

@@ -214,10 +214,7 @@ support symbolic links, a third boolean argument is available::
 
 :method:`Symfony\\Component\\Filesystem\\Filesystem::readlink` read links targets.
 
-PHP's :phpfunction:`readlink` function returns the target of a symbolic link. However, its behavior
-is completely different under Windows and Unix. On Windows systems, ``readlink()``
-resolves recursively the children links of a link until a final target is found. On
-Unix-based systems ``readlink()`` only resolves the next link.
+PHP's :phpfunction:`readlink` function returns the target of a symbolic link.
 
 The :method:`Symfony\\Component\\Filesystem\\Filesystem::readlink` method provided
 by the Filesystem component always behaves in the same way::