sql-statement-drop-stats: fix STATS_META output after DROP STATS

[doc-claw-bot]

What is changed, added or deleted? (Required)

• Clarify that DROP STATS removes histogram-related statistics but does not delete the STATS_META row.
• Update the example output to show that SHOW STATS_META still returns the row count and modify count after DROP STATS.
• Align the statement page with the current TiDB behavior verified during doc feedback handling.

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

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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

• This PR is translated from:
• Other reference link(s):
  • https://docs.pingcap.com/tidb/stable/sql-statement-drop-stats/

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

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

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 763bb1f and 83b729c.

📒 Files selected for processing (1)

• sql-statements/sql-statement-drop-stats.md

Included review availability: Your plan includes up to 4 reviews per rolling hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The DROP STATS example now shows that STATS_META retains row and modify counts while histogram statistics, including TopN and buckets, are cleared.

Changes

DROP STATS documentation

Layer / File(s)	Summary
Update STATS_META example sql-statements/sql-statement-drop-stats.md	The expected result now shows the retained metadata row and counts after DROP STATS. The example states that histogram-related statistics are cleared.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 83b72

This localized documentation update clarifies the expected output after DROP STATS and is merge-ready after normal checks, with no actionable merge-blocking risk remaining.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the affected statement and the corrected STATS_META output.
Description check	✅ Passed	The description covers the required change, affected version, reference link, AI involvement, and scope checks.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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