fix Merge request reference in merge commit is not global

app/models/merge_request.rb

@@ -682,9 +682,9 @@ class MergeRequest < ActiveRecord::Base
     if !include_description && closes_issues_references.present?
       message << "Closes #{closes_issues_references.to_sentence}"
     end
-
+    
     message << "#{description}" if include_description && description.present?
-    message << "See merge request #{to_reference}"
+    message << "See merge request #{to_reference(full: true)}"
 
     message.join("\n\n")
   end