[DOCS] Addresses feedback on STOP API.

Author: szabosteve

docs/reference/ml/anomaly-detection/apis/stop-datafeed.asciidoc

@@ -47,8 +47,18 @@ comma-separated list of {dfeeds} or a wildcard expression. You can close all
 ==== {api-query-parms-title}
 
 `allow_no_datafeeds`::
-  (Optional, boolean) If `false` and the `feed_id` does not match any {dfeed} an 
-  error will be returned. The default value is `true`.
+  (Optional, boolean) Specifies what to do when the request:
++
+--
+* Contains wildcard expressions and there are no {datafeeds} that match.
+* Contains the `_all` string or no identifiers and there are no matches.
+* Contains wildcard expressions and there are only partial matches. 
+
+The default value is `true`, which returns an empty `datafeeds` array when
+there are no matches and the subset of results when there are partial matches.
+If this parameter is `false`, the request returns a `404` status code when there
+are no matches or only partial matches.
+--
 
 [[ml-stop-datafeed-request-body]]
 ==== {api-request-body-title}
@@ -60,6 +70,13 @@ comma-separated list of {dfeeds} or a wildcard expression. You can close all
   (Optional, time) Controls the amount of time to wait until a {dfeed} stops.
   The default value is 20 seconds.
 
+[[ml-stop-datafeed-response-codes]]
+==== {api-response-codes-title}
+
+`404` (Missing resources)::
+  If `allow_no_datafeeds` is `false`, this code indicates that there are no
+  resources that match the request or only partial matches for the request.
+
 [[ml-stop-datafeed-example]]
 ==== {api-examples-title}