Fix DATATIME typo and precision/scale wording

[yahonda]

What is changed, added or deleted? (Required)

• sql-mode.md: fixes a typo, DATATIME → DATETIME, in the ALLOW_INVALID_DATES mode description.
• tidb-troubleshooting-map.md: DECIMAL(a, b) uses a for precision and b for scale; the text called both "the target precisions".

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): found while reviewing CodeRabbit feedback during Japanese translation review of i18n(ja): remove stray brace artifacts and fix accompanying word-order swaps #23699

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
  • Corrected a data type typo in the SQL mode reference.
  • Clarified the meanings of precision and scale parameters in a decimal conversion troubleshooting workaround.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 0dc31ea and 0c3a2d8.

📒 Files selected for processing (2)

• sql-mode.md
• tidb-troubleshooting-map.md

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📝 Walkthrough

Walkthrough

The change corrects two documentation inaccuracies: DATATIME is changed to DATETIME, and decimal casting parameters are described as precision and scale.

Changes

Documentation corrections

Layer / File(s)	Summary
SQL terminology corrections sql-mode.md, tidb-troubleshooting-map.md	The ALLOW_INVALID_DATES description uses DATETIME. The decimal casting workaround identifies a as precision and b as scale.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 8ef55

The changes improve documentation accuracy without affecting runtime behavior, so the PR is mergeable.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description identifies both documentation fixes, specifies the affected TiDB versions, provides a reference, and completes the applicable template sections. Optional fields are left blank appropri…
Title check	✅ Passed	The title clearly summarizes both changes: the DATATIME typo correction and the precision/scale wording correction.
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…
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.

✨ Finishing Touches

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• Create PR with unit tests

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