Remove warnings about WIP API.

openedx/core/djangoapps/user_api/accounts/views.py

 """
-NOTE: this API is WIP and has not yet been approved. Do not use this API without talking to Christina or Andy.
+An API for retrieving user account information.
 
-For more information, see:
+For additional information and historical context, see:
 https://openedx.atlassian.net/wiki/display/TNL/User+API
 """
+
 from django.db import transaction
 from edx_rest_framework_extensions.authentication import JwtAuthentication
 from rest_framework import permissions

openedx/core/djangoapps/user_api/preferences/views.py

 """
-NOTE: this API is WIP and has not yet been approved. Do not use this API
-without talking to Christina or Andy.
+An API for retrieving user preference information.
 
-For more information, see:
+For additional information and historical context, see:
 https://openedx.atlassian.net/wiki/display/TNL/User+API
 """
 from rest_framework.views import APIView