docs: add config "raftstore.appy-yield-msg-size"

[glorv]

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• This PR is translated from: tikv: add new config raftstore.apply-yield-write-size docs-cn#11831
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[REVIEW NOTIFICATION]

This pull request has been approved by:

• Oreoxmt
• qiancai

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[Oreoxmt]

Rest LGTM

[Oreoxmt]

LGTM

[qiancai]

/merge

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This pull request has been accepted and is ready to merge.

Commit hash: c49d9f2