fix comment

Author: wxiaoguang

templates/repo/commit_page.tmpl

@@ -68,6 +68,8 @@
 											<p id="cherry-pick-content" class="branch-dropdown"></p>
 
 											<form method="get">
+												{{/*FIXME: CurrentRefShortName seems not making sense here (old code),
+												because the "commit page" has no "$.BranchName" info, so only using DefaultBranch should be enough */}}
 												{{template "repo/branch_dropdown" dict
 													"Repository" .Repository
 													"ShowTabBranches" true