remove a unnecessary line (#7212)

pingcap · Sep 27, 2021 · dc54a12 · dc54a12
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diff --git a/optimizer-hints.md b/optimizer-hints.md
@@ -187,7 +187,6 @@ SELECT /*+ AGG_TO_COP() */ sum(t1.a) FROM t t1;
 
 `LIMIT_TO_COP()` 提示优化器将指定查询块中的 `Limit` 和 `TopN` 算子下推到 coprocessor。优化器没有下推 `Limit` 或者 `TopN` 算子时建议尝试使用该提示。例如：
 
-
 {{< copyable "sql" >}}
 
 ```sql