optimizer: modify docs for analyze behavior

[Liuxiaozhen12]

What is changed, added or deleted? (Required)

We've updated the analyze behavior when setting tidb_analyze_version=2 and change its default value to 2.

This pr is to make the doc compatible with it.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• 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)

What is the related PR or file link(s)?

• This PR is translated from: optimizer: modify docs for analyze behavior docs-cn#6410
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[Liuxiaozhen12]

/label v5.1
/translation from-docs-cn

[TomShawn]

LGTM

[ti-chi-bot]

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• TomShawn

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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.

Details

Commit hash: d67830e