Alerting: Fix swagger specification (#49273)

* Alerting: fix specification

* Update merged swagger specification

pkg/services/ngalert/api/tooling/definitions/provisioning_templates.go

@@ -14,7 +14,7 @@ import (
 // Get all message templates.
 //
 //     Responses:
-//       200: []MessageTemplate
+//       200: MessageTemplate
 //       400: ValidationError
 
 // swagger:route GET /api/provisioning/templates/{name} provisioning RouteGetTemplate
@@ -33,7 +33,7 @@ import (
 //     - application/json
 //
 //     Responses:
-//       202: Accepted
+//       202: Ack
 //       400: ValidationError
 
 // swagger:route DELETE /api/provisioning/templates/{name} provisioning RouteDeleteTemplate
@@ -41,14 +41,25 @@ import (
 // Delete a template.
 //
 //     Responses:
-//       204: Accepted
+//       204: Ack
 
+// swagger:parameters RouteGetTemplate RoutePutTemplate RouteDeleteTemplate
+type RouteGetTemplateParam struct {
+	// Template Name
+	// in:path
+	Name string `json:"name"`
+}
+
+// swagger:model
 type MessageTemplate struct {
 	Name       string
 	Template   string
 	Provenance models.Provenance `json:"provenance,omitempty"`
 }
 
+// swagger:model
+type MessageTemplates []MessageTemplate
+
 type MessageTemplateContent struct {
 	Template string
 }