docs: reword awkward 'increase the server configuration' wording

[yahonda]

What is changed, added or deleted? (Required)

best-practices/haproxy-best-practices.md's hardware requirements section says "You can increase the server configuration according to your load balancing environment." This is a literal translation of the Chinese source's 提高服务器配置 ("raise/upgrade the server configuration"), which reads as awkward English. Reworded "increase" to "upgrade" to better convey the intended meaning (using a higher-spec server), matching how "upgrade" is normally used for hardware/server specs in this doc set.

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 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: N/A (English wording clarity fix)
• Other reference link(s):

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

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated the “Hardware requirements” guidance to recommend upgrading server configuration according to the load-balancing environment.

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• best-practices/haproxy-best-practices.md

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📝 Walkthrough

Walkthrough

The hardware requirements section now says users can “upgrade” the server configuration according to the load balancing environment.

Changes

Hardware Requirements

Layer / File(s)	Summary
Update hardware requirements wording best-practices/haproxy-best-practices.md	Replaces “increase” with “upgrade” in the server configuration guidance.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to e692a

The wording change is limited to documentation and introduces no actionable merge risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the wording change in the HAProxy documentation.
Description check	✅ Passed	The description explains the change and reason, identifies the affected TiDB version, and includes the required checklist sections. Reference links are not required for this wording-only change.
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.

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