misspell: Corrected some misspelled words

pkg/services/alerting/extractor.go

@@ -89,7 +89,7 @@ func (e *DashAlertExtractor) GetAlerts() ([]*m.Alert, error) {
 				continue
 			}
 
-			// backward compatability check, can be removed later
+			// backward compatibility check, can be removed later
 			enabled, hasEnabled := jsonAlert.CheckGet("enabled")
 			if hasEnabled && enabled.MustBool() == false {
 				continue

pkg/services/alerting/notifiers/sensu.go

@@ -26,7 +26,7 @@ func init() {
       </div>
       <div class="gf-form">
         <span class="gf-form-label width-10">Source</span>
-        <input type="text" class="gf-form-input max-width-14" ng-model="ctrl.model.settings.source" bs-tooltip="'If emtpy rule id will be used'" data-placement="right"></input>
+        <input type="text" class="gf-form-input max-width-14" ng-model="ctrl.model.settings.source" bs-tooltip="'If empty rule id will be used'" data-placement="right"></input>
       </div>
       <div class="gf-form">
         <span class="gf-form-label width-10">Handler</span>

pkg/services/sqlstore/sqlstore.go

@@ -199,7 +199,7 @@ func LoadConfig() {
 
 	if DbCfg.Type == "sqlite3" {
 		UseSQLite3 = true
-		// only allow one connection as sqlite3 has multi threading issues that casue table locks
+		// only allow one connection as sqlite3 has multi threading issues that cause table locks
 		// DbCfg.MaxIdleConn = 1
 		// DbCfg.MaxOpenConn = 1
 	}