Documentation bug for LDAP authentication

While playing with LDAP authentication, I discovered
two documentation bugs.

First, user and password for the first step in the
two-step authentication mode are "ldapbinddn" and
"ldapbindpasswd", not "ldapbinduser" and "ldapbinddn".

This bug has been there since 8.4.

The second one is new in 9.3 with the URL syntax:
It is not possible to specify "user" and "password"
in the LDAP URL.

The first hunk should be backpatched.

Yours,
Laurenz Albe