Update embulk-output-sqlserver/README.md

fix

Co-authored-by: Dai MIKURUBE <[email protected]>

Author: naka-sho

embulk-output-sqlserver/README.md

@@ -62,7 +62,7 @@ embulk "-J-Djava.library.path=C:\drivers" run input-sqlserver.yml
   * Transactional: No. If fails, the target table could have some rows inserted.
   * Resumable: No.
 * **truncate_insert**:
-  * Behavior: Same with `insert` mode excepting that it truncates(using `delete from`, not using `truncate`)  the target table right before the last `INSERT ...` query.
+  * Behavior: Same with `insert` mode excepting that it truncates the target table (with SQL `DELETE FROM`, not `TRUNCATE`) right before the last `INSERT ...` query.
   * Transactional: Yes.
   * Resumable: No.
 * **replace**: