Merge branch 'mo-add-project-to-junit-doc' into 'master'

Add feature flag project toggle to junit documentation

See merge request gitlab-org/gitlab!32871

doc/ci/junit_test_reports.md

@@ -245,6 +245,9 @@ following command:
 
 ```ruby
 Feature.enable(:junit_pipeline_view)
+
+# Enable the feature for a specific project
+Feature.enable(:junit_pipeline_view, Project.find(<your-project-id-here>))
 ```
 
 ## Viewing JUnit screenshots on GitLab