cifs: fix a comment for the timeouts when sending echos

Clarify a trivial comment
Signed-off-by: NRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>

fs/cifs/connect.c

@@ -712,7 +712,7 @@ server_unresponsive(struct TCP_Server_Info *server)
 	 * We need to wait 3 echo intervals to make sure we handle such
 	 * situations right:
 	 * 1s  client sends a normal SMB request
-	 * 3s  client gets a response
+	 * 2s  client gets a response
 	 * 30s echo workqueue job pops, and decides we got a response recently
 	 *     and don't need to send another
 	 * ...