Removed versionadded/changed annotations for 5.0.

This also removes remaining versionadded/changed annotations for older
versions.

docs/topics/auth/customizing.txt

@@ -703,10 +703,6 @@ The following attributes and methods are available on any subclass of
         the user. (This takes care of the password hashing in making the
         comparison.)
 
-        .. versionchanged:: 5.0
-
-            ``acheck_password()`` method was added.
-
     .. method:: models.AbstractBaseUser.set_unusable_password()
 
         Marks the user as having no password set.  This isn't the same as

docs/topics/auth/default.txt

@@ -155,10 +155,6 @@ Authenticating users
         this. Rather if you're looking for a way to login a user, use the
         :class:`~django.contrib.auth.views.LoginView`.
 
-    .. versionchanged:: 5.0
-
-        ``aauthenticate()`` function was added.
-
 .. _topic-authorization:
 
 Permissions and Authorization
@@ -401,10 +397,6 @@ Or in an asynchronous view::
         # Do something for anonymous users.
         ...
 
-.. versionchanged:: 5.0
-
-    The :meth:`.HttpRequest.auser` method was added.
-
 .. _how-to-log-a-user-in:
 
 How to log a user in
@@ -446,10 +438,6 @@ If you have an authenticated user you want to attach to the current session
                 # Return an 'invalid login' error message.
                 ...
 
-    .. versionchanged:: 5.0
-
-        ``alogin()`` function was added.
-
 Selecting the authentication backend
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -505,10 +493,6 @@ How to log a user out
     immediately after logging out, do that *after* calling
     :func:`django.contrib.auth.logout()`.
 
-    .. versionchanged:: 5.0
-
-        ``alogout()`` function was added.
-
 Limiting access to logged-in users
 ----------------------------------
 
@@ -1000,10 +984,6 @@ function.
             else:
                 ...
 
-    .. versionchanged:: 5.0
-
-        ``aupdate_session_auth_hash()`` function was added.
-
 .. note::
 
     Since

docs/topics/auth/passwords.txt

@@ -493,10 +493,6 @@ from the ``User`` model.
     to use the default (first entry of ``PASSWORD_HASHERS`` setting). See
     :ref:`auth-included-hashers` for the algorithm name of each hasher.
 
-    .. versionchanged:: 5.0
-
-        ``acheck_password()`` method was added.
-
 .. function:: make_password(password, salt=None, hasher='default')
 
     Creates a hashed password in the format used by this application. It takes