Several docs pages misname Grafana panel/dashboard titles (casing/spelling mismatches)

Error Report

1. What is the URL/path of the document related to this issue?

• https://docs.pingcap.com/tidb/dev/tikv-configuration-file (tikv-configuration-file.md)
• https://docs.pingcap.com/tidb/dev/troubleshoot-high-cpu-usage (troubleshoot-cpu-issues.md)
• https://docs.pingcap.com/tidb/dev/alert-rules (alert-rules.md)
• https://docs.pingcap.com/tidb/dev/best-practices/massive-regions-best-practices (best-practices/massive-regions-best-practices.md)
• https://docs.pingcap.com/tidb/dev/grafana-performance-overview-dashboard (grafana-performance-overview-dashboard.md)

2. How would you like to improve it?

Found several places where docs prose names a Grafana dashboard or panel with a casing/spelling that doesn't match the actual panel "title" in the dashboard JSON (pingcap/monitoring), which would make it hard for a reader to find the panel by the name given in the docs:

• The TiKV monitoring dashboard's real title is TiKV-Details (hyphenated, both words capitalized — confirmed via the dashboard JSON's own title field, e.g. Test-Cluster-TiKV-Details). A few places spell it differently:
  • tikv-configuration-file.md (max-background-gc config item): "TiKV Details" (space instead of hyphen)
  • troubleshoot-cpu-issues.md: "TiKV-details" (lowercase "d"), 2 occurrences
• best-practices/massive-regions-best-practices.md says the panel is "Thread-CPU" (hyphenated), but the real panel title in tikv_details.json is "Thread CPU" (space, no hyphen).
• alert-rules.md (the section starting "For versions earlier than v3.0...") says "Raft propose" (lowercase "propose"), but the real panel title in tikv_details.json is "Raft Propose" (capitalized). A sibling section earlier in the same file already correctly says "Raft Propose".
• grafana-performance-overview-dashboard.md lists a panel bullet as "Execution Duration", but the real panel title in performance_overview.json is "Execute Duration" — matching the section's own heading ("Parse Duration, Compile Duration, and Execute Duration") just above it.

Could someone fix these 5 sites to use the exact real panel/dashboard titles? Happy to provide the exact old/new strings if useful.

(Found while reviewing the Japanese translation of these pages — the JA translations have already been corrected to match the real panel names, ahead of these EN fixes.)

Start with the five files named in the issue: tikv-configuration-file.md, troubleshoot-cpu-issues.md, alert-rules.md, best-practices/massive-regions-best-practices.md, and grafana-performance-overview-dashboard.md. Compare each cited name with the relevant dashboard JSON titles, then update the five mismatches and verify that the English pages use the exact panel or dashboard titles.