Add MSC3069 support

#3069

Author: turt2live

content/client-server-api/modules/guest_access.md

@@ -64,6 +64,7 @@ for their own account maintenance:
 -   [GET /devices](#get_matrixclientv3devices)
 -   [GET /devices/{deviceId}](#get_matrixclientv3devicesdeviceid)
 -   [PUT /devices/{deviceId}](#put_matrixclientv3devicesdeviceid)
+-   {{% added-in v="1.2" %}} [GET /account/whoami](#get_matrixclientv3accountwhoami)
 
 The following API endpoints are allowed to be accessed by guest accounts
 for end-to-end encryption:

data/api/client-server/whoami.yaml

@@ -65,6 +65,13 @@ paths:
                   is associated with the access token (such as in the case
                   of application services) then this field can be omitted.
                   Otherwise this is required.
+              is_guest:
+                x-addedInMatrixVersion: "1.2"
+                type: boolean
+                description: |-
+                  When `true`, the user is a [Guest User](#guest-access). When
+                  not present or `false`, the user is presumed to be a non-guest
+                  user.
         401:
           description:
             The token is not recognised