add Other strategies for memory control

[Mystery-cyf]

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[Oreoxmt]

@TomShawn PTAL tidb-server 其它内存控制策略在 5.2 及以上文档中是已经存在的，5.1 版本是否需要添加

[TomShawn]

/verify

[TomShawn]

@TomShawn PTAL tidb-server 其它内存控制策略在 5.2 及以上文档中是已经存在的，5.1 版本是否需要添加

This section was originally added in #6819 as a v5.2 doc PR. Some of it might apply while some do not apply (hashAgg). I think we should invite a technical reviewer. @wshwsh12

[TomShawn]

/verify

[Oreoxmt]

/verify