update title

Signed-off-by: okJiang <[email protected]>

Author: okJiang

pkg/metrics/grafana/tidb.json

@@ -13403,7 +13403,7 @@
           "timeFrom": null,
           "timeRegions": [],
           "timeShift": null,
-          "title": "Stale Region from PD",
+          "title": "Stale Region From PD",
           "tooltip": {
             "msResolution": false,
             "shared": true,