keywords: add seven missing non-reserved keywords

[sary8]

What is changed, added, or deleted? (Required)

Add the ALERT, AUTO, FAST, IMMEDIATE, MATERIALIZED, OPERATE, and TRANSITIONS non-reserved keywords to keywords.md so it matches the current TiDB parser. All seven are defined as UnReservedKeyword in pkg/parser/parser.y, and scripts/check-keywords.py passes with them added.

Fixes #23846, closes #23750, and closes #23670. The last two are earlier runs of the same weekly check.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• 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)

None of the seven keywords is in the release-8.5 parser, and the weekly check reports that branch as passing, so no cherry-pick label is added.

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

• Related code change PR links (if applicable): pingcap/tidb#70744, pingcap/tidb#69425, pingcap/tidb#70694, pingcap/tidb#70660
• This PR is translated from:
• Other reference link(s): Weekly keywords check: mismatches found #23846, Weekly keywords check: mismatches found #23750, Weekly keywords check: mismatches found #23670

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

Summary by CodeRabbit

• Documentation
  • Updated the TiDB keyword reference with seven additional keywords: ALERT, AUTO, FAST, IMMEDIATE, MATERIALIZED, OPERATE, and TRANSITIONS.
  • Added the keywords in alphabetical order without reserved-word markers.

[ti-chi-bot]

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[ti-chi-bot]

Hi @sary8. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coderabbitai]

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ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between f9f08f3 and 4f01f16.

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• keywords.md

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📝 Walkthrough

Walkthrough

The TiDB keyword list now includes ALERT, AUTO, FAST, IMMEDIATE, MATERIALIZED, OPERATE, and TRANSITIONS in alphabetical order under their corresponding letter sections.

Changes

Keyword documentation

Layer / File(s)	Summary
Add missing keyword entries keywords.md	Adds seven non-reserved keywords to the alphabetical keyword list without (R) or (R-Window) markers.

Priority: ⬇️ Low

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

Change: Other · Severity of issue fixed: Low

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the addition of seven missing non-reserved keywords.
Description check	✅ Passed	The description covers the required change, affected version, related links, AI involvement, and change-category checklist. It also explains why only the master branch is affected.
Linked Issues check	✅ Passed	The changes satisfy the coding requirements in [#23846], [#23750], and [#23670]. keywords.md adds all seven reported UnReservedKeyword entries: ALERT, AUTO, FAST, IMMEDIATE, MATERIALIZED…
Out of Scope Changes check	✅ Passed	The PR changes only keywords.md and adds the seven keywords required by [#23846], [#23750], and [#23670]. No unrelated source, release-branch, or other documentation changes are reported.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

✨ Finishing Touches

🧪 Generate unit tests (beta)

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