bug #4079 Fixed typo in filesystem component (kohkimakimoto)

This PR was merged into the 2.3 branch.

Discussion
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Fixed typo in filesystem component

The `makePathRelative` method returns a path with a slash at end.
See this [test case](https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php#L793).

Commits
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82d2903 Fixed typo in filesystem component

components/filesystem.rst

@@ -207,7 +207,7 @@ the relative path of a directory given another one::
         '/var/lib/symfony/src/Symfony/',
         '/var/lib/symfony/src/Symfony/Component'
     );
-    // returns 'videos'
+    // returns 'videos/'
     $fs->makePathRelative('/tmp/videos', '/tmp')
 
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