Remove reference for attaching queries.

This was added in commit 85b84078f8 from pull request 1072.

Pull request 1014 would of made this command possible, but it was never pulled.

src/Client.cpp

@@ -1285,7 +1285,7 @@ bool CClient::OnOtherMessage(CMessage& Message) {
         CString sPatterns = Message.GetParams(0);
 
         if (sPatterns.empty()) {
-            PutStatusNotice("Usage: /attach <#chans|queries>");
+            PutStatusNotice("Usage: /attach <#chans>");
             return true;
         }