docs: Clean up documentation for fakeldap testing in development.

docs/subsystems/auth.md

@@ -66,8 +66,8 @@ actual flows for LDAP configuration.
 
 - To enable fakeldap, set `FAKE_LDAP_MODE` in
 `zproject/dev_settings.py` to one of the following options.  For more
-information on these modes, refer
-`zproject/prod_settings_template.py`.:
+information on these modes, refer to
+[our production docs](../production/authentication-methods.html#ldap-including-active-directory):
   - `a`: If users' email addresses are in LDAP and used as username.
   - `b`: If LDAP only has usernames but email addresses are of the form
   username@example.com

zproject/dev_settings.py

@@ -94,14 +94,13 @@ ALWAYS_SEND_ALL_HOTSPOTS = False  # type: bool
 #
 # Three modes are allowed, and each will setup Zulip and the fake LDAP
 # database in a way appropriate for the corresponding mode described
-# in zproject/prod_settings_template.py:
+# in https://zulip.readthedocs.io/en/latest/production/authentication-methods.html#ldap-including-active-directory
 #   (A) If users' email addresses are in LDAP and used as username.
 #   (B) If LDAP only has usernames but email addresses are of the form
 #       username@example.com
 #   (C) If LDAP usernames are completely unrelated to email addresses.
 #
-# In any case, the LDAP user account data is available in:
-#    zerver/tests/fixtures/ldap_dir.json
+# Fake LDAP data has e.g. ("ldapuser1", "ldapuser1@zulip.com") for username/email.
 FAKE_LDAP_MODE = None  # type: Optional[str]
 # FAKE_LDAP_NUM_USERS = 8