Fixed #36597 -- Corrected directives for functions from email module in docs.

Thanks Mike Edmunds for the report.

docs/ref/contrib/auth.txt

@@ -294,7 +294,7 @@ Methods
 
         Sends an email to the user. If ``from_email`` is ``None``, Django uses
         the :setting:`DEFAULT_FROM_EMAIL`. Any ``**kwargs`` are passed to the
-        underlying :meth:`~django.core.mail.send_mail` call.
+        underlying :func:`~django.core.mail.send_mail` call.
 
 Manager methods
 ---------------

docs/ref/django-admin.txt

@@ -1052,12 +1052,12 @@ together:
 .. django-admin-option:: --managers
 
 Mails the email addresses specified in :setting:`MANAGERS` using
-:meth:`~django.core.mail.mail_managers`.
+:func:`~django.core.mail.mail_managers`.
 
 .. django-admin-option:: --admins
 
 Mails the email addresses specified in :setting:`ADMINS` using
-:meth:`~django.core.mail.mail_admins`.
+:func:`~django.core.mail.mail_admins`.
 
 ``shell``
 ---------

docs/ref/settings.txt

@@ -2656,7 +2656,7 @@ protocol.
 .. admonition:: Why are my emails sent from a different address?
 
     This address is used only for error messages. It is *not* the address that
-    regular email messages sent with :meth:`~django.core.mail.send_mail`
+    regular email messages sent with :func:`~django.core.mail.send_mail`
     come from; for that, see :setting:`DEFAULT_FROM_EMAIL`.
 
 .. setting:: SHORT_DATE_FORMAT