Merge branch 'fp-update-invalid-anchor-link' into 'master'

Update invalid anchor link

See merge request gitlab-org/gitlab-ce!28822

doc/development/rolling_out_changes_using_feature_flags.md

@@ -200,10 +200,9 @@ isn't gated by a License or Plan.
 
 ### Undefined feature flags default to "on"
 
-An important side-effect of the [implicit feature
-flags][#implicit-feature-flags] mentioned above is that unless the feature is
-explicitly disabled or limited to a percentage of users, the feature flag check
-will default to `true`.
+An important side-effect of the [implicit feature flags](#implicit-feature-flags) 
+mentioned above is that unless the feature is explicitly disabled or limited to a 
+percentage of users, the feature flag check will default to `true`.
 
 As an example, if you were to ship the backend half of a feature behind a flag,
 you'd want to explicitly disable that flag until the frontend half is also ready