Fix merge requests project settings help link anchor.

CHANGELOG

@@ -8,6 +8,7 @@ v 8.10.0 (unreleased)
   - Implement Subresource Integrity for CSS and JavaScript assets. This prevents malicious assets from loading in the case of a CDN compromise.
 
 v 8.9.1
+  - Fix merge requests project settings help link anchor
   - Fix GitLab project import issues related to notes and builds
 
 v 8.9.0

app/views/projects/_merge_request_settings.html.haml

@@ -8,4 +8,4 @@
         %strong Only allow merge requests to be merged if the build succeeds
       .help-block
         Builds need to be configured to enable this feature.
-        = link_to icon('question-circle'), help_page_path('workflow', 'merge_requests#only-allow-merge-requests-to-be-merged-if-the-build-succeeds')
+        = link_to icon('question-circle'), help_page_path('workflow', 'merge_requests', anchor: 'only-allow-merge-requests-to-be-merged-if-the-build-succeeds')