enh: code optimization for insert_req statistics

source/dnode/vnode/src/vnd/vnodeSvr.c

@@ -953,7 +953,7 @@ _exit:
     tdProcessRSmaSubmit(pVnode->pSma, pReq, STREAM_INPUT__DATA_SUBMIT);
   }
 
-  // N.B not strict as the following update steps is not atomic
+  // N.B. not strict as the following update steps is not atomic
   atomic_add_fetch_64(&pVnode->statis.nInsert, submitRsp.numOfRows);
   atomic_add_fetch_64(&pVnode->statis.nInsertSuccess, submitRsp.affectedRows);
   atomic_add_fetch_64(&pVnode->statis.nBatchInsert, statis.nBatchInsert);