Merge branch 'add-documentation-to-freeze' into 'master'

Documentation does not need an exception to be picked

See merge request gitlab-org/gitlab-ce!19741

PROCESS.md

@@ -169,6 +169,7 @@ the stable branch are:
 * Fixes for [regressions](#regressions)
 * Fixes for security issues
 * Fixes or improvements to automated QA scenarios
+* Documentation updates for changes in the same release
 * New or updated translations (as long as they do not touch application code)
 
 During the feature freeze all merge requests that are meant to go into the