Merge branch 'mk/fix-old-feature-flags-link-docs' into 'master'

Docs: Replace issue with a link to the feature

See merge request gitlab-org/gitlab-ce!25670

doc/development/feature_flags.md

@@ -26,8 +26,9 @@ the time, you should execute `/chatops run feature set my_feature_flag 50`.
 
 ## Feature flags for user applications
 
-GitLab does not yet support the use of feature flags in deployed user applications.
-You can follow the progress on that [in the issue on our issue tracker](https://gitlab.com/gitlab-org/gitlab-ee/issues/779).
+This document only covers feature flags used in the development of GitLab 
+itself. Feature flags in deployed user applications can be found at 
+[Feature Flags](https://docs.gitlab.com/ee/user/project/operations/feature_flags.html)
 
 ## Developing with feature flags