8.5 performance highlights: update the table for IO jitter improvement

[qiancai]

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[qiancai]

preview: https://pr.pingcap-docsite-preview.pages.dev/tidbcloud/v8.5-performance-highlights#test-results-1

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-07 02:04:00.748165843 +0000 UTC m=+232784.036997549: ☑️ agreed by Oreoxmt.

[kennedy8312]

We might remove the P99 and P999 figures after collecting feedbacks.

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@kennedy8312: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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We might remove the P99 and P999 figures after collecting feedbacks.

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[qiancai]

/approve

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