Update links to documentation

Author: shahariaazam

README.md

@@ -7,7 +7,7 @@ The Security CSRF (cross-site request forgery) component provides a class
 Resources
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-  * [Documentation](https://symfony.com/doc/current/components/security/index.html)
+  * [Documentation](https://symfony.com/doc/current/components/security.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)