tikv: add doc for new config `max-apply-unpersisted-log-limit`

[glorv]

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Add description for new config raftstore.max-apply-unpersisted-log-limit

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[ti-chi-bot[bot]]

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[qiancai]

/label v8.2

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Timeline:

• 2024-06-07 08:21:18.69090277 +0000 UTC m=+107232.744214693: :ballot_box_with_check: agreed by qiancai.
• 2024-06-13 08:31:23.067251651 +0000 UTC m=+626237.120563574: :ballot_box_with_check: agreed by Oreoxmt.

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #17815.