[TASK][DOC] Default LDAP listening port numbers in FAQ

Change-Id: I1cd9072bee353e10936699518d6763e61733ab2b
Reviewed-on: http://review.typo3.org/32171
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>