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Update optional-match.md #2331

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Update optional-match.md #2331

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4 changes: 4 additions & 0 deletions docs-2.0/3.ngql-guide/7.general-query-statements/optional-match.md
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# OPTIONAL MATCH

!!! caution

目前 `OPTIONAL MATCH` 为 Beta 功能，后续可能会有一定优化调整。

`OPTIONAL MATCH`通常与`MATCH`语句一起使用，作为`MATCH`语句的可选项去匹配命中的模式，如果没有命中对应的模式，对应的列返回`NULL`。

## openCypher 兼容性
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