Backports DOCSP-43385 to v6.0. (#513)

[DOCSP-43385](https://jira.mongodb.org/browse/DOCSP-43385)
Backports #499

Author: erabil-mdb

source/includes/api/list-tables/alerts/response-elements.rst

@@ -179,10 +179,6 @@
      - string array
      - Identifying labels set for this alert.
 
-   * - ``typeName``
-     - string
-     - *Deprecated field. |mms| ignores it.*
-
    * - ``updated``
      - string
      - |iso8601-time| when the alert was last updated.

source/reference/api/alerts-get-all-alerts.txt

@@ -155,7 +155,6 @@ Response Body
        } ],
        "status" : "OPEN",
        "tags" : [ ],
-       "typeName" : "AGENT",
        "updated" : "2019-07-18T23:43:50Z"
      } ],
      "totalCount" : 1