update comment

Author: bvogelzang

ext/tiny_tds/client.c

@@ -146,9 +146,9 @@ int tinytds_msg_handler(DBPROCESS *dbproc, DBINT msgno, int msgstate, int severi
   // See tinytds_err_handler() for info about why we do this
   if (userdata && userdata->nonblocking) {
     /*
-    In the case of stored procedure execution we can receive multiple messages
-    (including errors). We keep track of those here so they can be processed
-    once the blocking call returns.
+    In the case of non-blocking command batch execution we can receive multiple messages
+    (including errors). We keep track of those here so they can be processed once the
+    non-blocking call returns.
     */
     tinytds_errordata error = {
       .is_message = !is_message_an_error,