tikv config: 补充 resource-metering.enable-network-io-collection 配置项说明

[yibin87]

What is changed, added or deleted? (Required)

补充 tikv-configuration-file.md 中 resource-metering.enable-network-io-collection 配置项说明，包含以下内容：

• 默认值为 false
• 开启后会采集网络流量和逻辑 I/O
• 说明该配置对 Resource Metering 上报时 Top N 筛选和按 Region 维度上报的影响
• 补充逻辑 I/O 与实际物理 I/O 的区别说明，避免混淆
• 同时移除该文件中两个容易触发 link checker 429 的 GitHub 外链，避免 CI 因限流失败

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• 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)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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

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[yibin87]

Merged into #21431.