Merge branch '299489-milestone_state_enum_style_guide' into 'master'

Update MilestoneStateEnum to match style guide

See merge request gitlab-org/gitlab!53287

app/graphql/types/milestone_state_enum.rb

@@ -5,7 +5,7 @@ module Types
     graphql_name 'MilestoneStateEnum'
     description 'Current state of milestone'
 
-    value 'active', 'Milestone is currently active'
-    value 'closed', 'Milestone is closed'
+    value 'active', description: 'Milestone is currently active'
+    value 'closed', description: 'Milestone is closed'
   end
 end