tikv: update rocksdb.max-manifest-file-size default value

[glorv]

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• Other reference link(s): config: adjust default value of config rocksdb.max-manifest-file-size from 128MiB to 256MiB tikv/tikv#18496

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[glorv]

@hbisheng PTAL

[qiancai]

Suggested change

	+ 默认值：256MiB
	+ 默认值：256MiB。在 v9.0.0 之前，默认值为 `128MiB`。

[glorv]

抱歉，这个也需要 cp 到老版本，上面忘记勾选相关的版本了。现在 cherry-pick 的流程有点复杂，不知道 cp 的 PR 啥时候才能 merge，所以本来是打算等相关 cp pr merge 了在更新 doc 的 pr 的。

[Connor1996]

LGTM

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