Add summary and tag to ml.validate (#3391) (#3435)

(cherry picked from commit 024f6ff)

Co-authored-by: Lisa Cawley <[email protected]>

Author: github-actions[bot]

specification/ml/validate/MlValidateJobRequest.ts

@@ -25,9 +25,11 @@ import { Id, IndexName } from '@_types/common'
 import { long } from '@_types/Numeric'
 
 /**
+ * Validate an anomaly detection job.
  * @rest_spec_name ml.validate
  * @availability stack since=6.3.0 stability=stable visibility=private
  * @availability serverless stability=stable visibility=private
+ * @doc_tag ml anomaly
  */
 export interface Request extends RequestBase {
   body: {