Merge branch 'docs/rs-revert-api-version' into 'master'

Revert API is going into 11.5, not 11.6.

See merge request gitlab-org/gitlab-ce!23060

doc/api/commits.md

@@ -290,7 +290,7 @@ Example response:
 
 ## Revert a commit
 
-> [Introduced][ce-22919] in GitLab 11.6.
+> [Introduced][ce-22919] in GitLab 11.5.
 
 Reverts a commit in a given branch.
 

lib/api/commits.rb

@@ -207,7 +207,7 @@ module API
       end
 
       desc 'Revert a commit in a branch' do
-        detail 'This feature was introduced in GitLab 11.6'
+        detail 'This feature was introduced in GitLab 11.5'
         success Entities::Commit
       end
       params do