Fix tool name capitalization for product names to prevent mistranslation

[yahonda]

What is changed, added or deleted? (Required)

Changed lowercase product names to proper capitalization in prose text to prevent mistranslation during localization (e.g., Japanese translation):

• 'lightning' -> 'Lightning' (could be mistranslated as 雷/稲妻)
• 'pump' -> 'Pump' (could be mistranslated as ポンプ)
• 'tiflash' -> 'TiFlash' (when used as product name in prose)

Note: 'syncer' is not changed as it is not maintained and should remain lowercase.

Command line references, file names, URLs, paths, and configuration values remain unchanged.

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For details, see tips for choosing the affected versions.

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
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• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

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Do your changes match any of the following descriptions?

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

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[gemini-code-assist]

Code Review

This pull request standardizes the capitalization of various component names (such as Syncer, Pump, Lightning, and TiFlash) across multiple documentation files. The review feedback provides actionable suggestions to further align the text with the style guide, including converting passive voice to active voice, writing in the second person ("you"), correcting grammatical issues, and ensuring consistent terminology (e.g., using "parameter" instead of "item" and capitalizing join types).

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-06-12 06:00:50.549328281 +0000 UTC m=+1112551.619645661: ☑️ agreed by qiancai.