Mark CommonMark Markdown (GitHub Flavored) as experimental (#32424).

git-svn-id: http://svn.redmine.org/redmine/trunk@21160 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine.rb

@@ -448,7 +448,7 @@ Redmine::WikiFormatting.map do |format|
   format.register :textile
   format.register :markdown if Object.const_defined?(:Redcarpet)
   if Object.const_defined?(:CommonMarker)
-    format.register :common_mark, label: 'CommonMark Markdown (GitHub Flavored)'
+    format.register :common_mark, label: 'CommonMark Markdown (GitHub Flavored) - experimental'
   end
 end