Update docs/ref/dotz.md

Author: JosieMD

docs/ref/dotz.md

@@ -105,22 +105,11 @@ An HTTP callback to handle the request will not be called.
 ```q
 (1;"username")
 ```
-The provided username will be used to set [`.z.u`](#zu-user-id). 
+The provided username is used to set [`.z.u`](#zu-user-id). 
 The relevant HTTP callback to handle this request will be allowed.
 * User not authorized/authenticated (custom response)
 ```q
 (2;"response text")
-```
-Customised reponse to be sent should be provided in the "response text" section.
-The "response text" should comprised of a valid HTTP response message e.g. can be used to provide a 
-401 response with a customised message.
-A HTTP callback to handle the original request will not be called.
-* Fallback to basic authentication
-```q
-(4;"")
-```
-Fallback to [basic access authentication](https://en.wikipedia.org/wiki/Basic_access_authentication#Client_side), where the username/password are base64 decoded and processed via the [`-u`](../basics/cmdline.md#-u-usr-pwd-local)/[`-U`](../basics/cmdline.md#-u-usr-pwd) file and [`.z.pw`](#zpw-validate-user) (if defined). 
-If the user is not permitted, the client will be sent a default 401 HTTP unauthorized response. Since V4.0 2021.07.12.
 
 !!! note "If .z.ac is not defined, it uses basic access authentication as per `(4;"")` above"