docs: reload grafana with prometheus when enabling agent mode

[doc-claw-bot]

What is changed, added or deleted? (Required)

• update the Prometheus agent mode step to reload both Prometheus and Grafana
• clarify that the configuration change applies to both components

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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)

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• 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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