Use right-alighed markdown to compare numbers in min-blob-size

[yahonda]

What is changed, added or deleted? (Required)

This pull request uses the right-alighed markdown to compare numbers in min-blob-size easily. See https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/organizing-information-with-tables for the detail.

IMO, it is easy to compare right-alined numbers than left-aligned ones.

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• [x] master (the latest development version)
• [ ] v7.6 (TiDB 7.6 versions)
• [ ] v7.5 (TiDB 7.5 versions)
• [ ] v7.4 (TiDB 7.4 versions)
• [ ] v7.3 (TiDB 7.3 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)
• [ ] v5.2 (TiDB 5.2 versions)
• [ ] v5.1 (TiDB 5.1 versions)
• [ ] v5.0 (TiDB 5.0 versions)

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Oreoxmt]

Preview link: https://pingcap-docsite-preview-git-preview-pingcapdocs16326-oreoxmt.vercel.app/tidb/dev/titan-overview#impact-of-min-blob-size-on-performance

@yahonda Thanks for your contribution. However, it seems our website currently does not support this syntax, causing the table to not be right-aligned:

@Yuiham Would you please help check? Thanks.

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-28 05:54:38.669939608 +0000 UTC m=+2755832.427075176: :ballot_box_with_check: agreed by qiancai.