Update links to documentation

Author: shahariaazam

README.md

@@ -6,7 +6,7 @@ The Filesystem component provides basic utilities for the filesystem.
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/filesystem/index.html)
+  * [Documentation](https://symfony.com/doc/current/components/filesystem.html)
   * [Contributing](https://symfony.com/doc/current/contributing/index.html)
   * [Report issues](https://github.com/symfony/symfony/issues) and
     [send Pull Requests](https://github.com/symfony/symfony/pulls)