Dashboard schema: Review and mature refresh property (#62104)

* Review and mature refresh property

* Update type

* Update report

pkg/kinds/dashboard/dashboard_types_gen.go

@@ -240,7 +240,7 @@ type Dashboard struct {
 	LiveNow *bool          `json:"liveNow,omitempty"`
 	Panels  *[]interface{} `json:"panels,omitempty"`
 
-	// TODO docs
+	// Refresh rate of dashboard. Represented via interval string, e.g. "5s", "1m", "1h", "1d".
 	Refresh *interface{} `json:"refresh,omitempty"`
 
 	// Version of the current dashboard data

pkg/kindsys/report.json

@@ -283,7 +283,7 @@
         0,
         0
       ],
-      "grafanaMaturityCount": 141,
+      "grafanaMaturityCount": 140,
       "lineageIsGroup": false,
       "links": {
         "docs": "https://grafana.com/docs/grafana/next/developers/kinds/core/dashboard/schema-reference",