statistics.md: update the content of analyze version2 OOM handling

[tiancaiamao]

First-time contributors' checklist

• [X] I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Close #8136

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• [x] master (the latest development version)
• [x] v5.4 (TiDB 5.4 versions)
• [x] v5.3 (TiDB 5.3 versions)
• [x] v5.2 (TiDB 5.2 versions)
• [x] v5.1 (TiDB 5.1 versions)
• [ ] v5.0 (TiDB 5.0 versions)
• [ ] v4.0 (TiDB 4.0 versions)
• [ ] v3.1 (TiDB 3.1 versions)
• [ ] v3.0 (TiDB 3.0 versions)
• [ ] v2.1 (TiDB 2.1 versions)

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Do your changes match any of the following descriptions?

• [ ] Delete files
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• [ ] Might cause conflicts after applied to another branch

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

@tiancaiamao Could you please invite a technical review? Thanks!

[tiancaiamao]

PTAL @winoros

[tiancaiamao]

PTAL @TomShawn

[TomShawn]

/merge

[ti-chi-bot]

@TomShawn: /merge in this pull request requires 2 approval(s).

In response to this:

/merge

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[TomShawn]

/remove-status LGT1 /status LGT2

[TomShawn]

/merge

[ti-chi-bot]

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

Commit hash: a0463a7584620ab35fad6b4602865f0f52e1f50f

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12352.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.1: #12353.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.2: #12354.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #12355.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #12356.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12357.