DERBY-5878: Update dtd for messages.xml to include the newly added comment element.
DERBY-5878: Update dtd for messages.xml to include the newly added comment element.

git-svn-id: 2c06e9c5008124d912b69f0b82df29d4867c0ce2@1371234 13f79535-47bb-0310-9956-ffa450edef68

apache/derby,trejkaz/derby,apache/derby,trejkaz/derby,trejkaz/derby,apache/derby,apache/derby