code: fix typo (#76)

* Update ob_dtl_rpc_channel.cpp

* Update ob_time_convert.cpp

* Update ob_time_convert.h

* Update ob_expr_date_add.cpp

* fix log spell error:faild -> failled, Faild -> Failed

* Update ob_optimizer_util.cpp

* Update ob_sql.cpp

* Update ob_optimizer_util.cpp

* Update ob_plan_cache_manager.cpp

* Update ob_partition_merge_task.cpp

src/sql/engine/join/ob_hj_batch.cpp

@@ -41,7 +41,7 @@ int ObHJBatch::load_next_chunk()
 {
   int ret = OB_SUCCESS;
   if (OB_FAIL(chunk_iter_.load_next_chunk(row_store_iter_))) {
-    LOG_WARN("faild to load next chunk", K(ret));
+    LOG_WARN("failed to load next chunk", K(ret));
   }
   return ret;
 }