fix inconsistent spelling of "consistency"

[schmonz]

@@ -1013,8 +1017,8 @@ sub syntax {
     -B
       b       Backup queue into ${qmail}/queue.backup/
       r       Restore backup from ${qmail}/queue.backup/
-    -c        check queue consitancy
-    -r        repair queue (by deleting fragments) found by checking queue consistancy
+    -c        check queue consistency
+    -r        repair queue (by deleting fragments) found by checking queue consistency
     -i        show how many messages are queued per ip address
        -nN    pay attention to the Nth last smtp-hop
     -S        show how many bytes are queued per ip address