Bug 6518: add POD documentation to Plugin::AskDNS
Bug 6518: add POD documentation to Plugin::AskDNS

git-svn-id: e9fe9b84e32fc5e57b7d09c40cd78b14ea28ed71@1041671 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin