Fix broken link for push rule documentation

* Current generated url: https://gitlab.com/help/push_rules/push_rules.md%23push-rules
* Fixed working url: https://gitlab.com/help/push_rules/push_rules.md

Fixes: gitlab-org/gitlab#30749

ee/app/views/shared/promotions/_promote_repository_features.html.haml

@@ -14,7 +14,7 @@
         %ul
           - unless @project.feature_available?(:push_rules)
             %li
-              = link_to 'Push Rules', help_page_path('push_rules/push_rules.md#push-rules'), target: '_blank'
+              = link_to 'Push Rules', help_page_path('push_rules/push_rules.md'), target: '_blank'
               %p
                 Push Rules are defined per project so you can have different rules applied to different projects depends on your needs.
           - unless @project.feature_available?(:repository_mirrors)