Bug#376459: exim4-config: issues with ACL documentation

[Ross Boylan]

I noticed one more:
30_exim4-config_check_rcpt:
  # The explicit white lists are honored as well as negative items in
  # the black list. See /usr/share/doc/exim4-config/default_acl for
  details.
that's toward the bottom

Which inspired this check:
wheat:/etc/exim4# find . -type f -exec grep -H default_acl \{\} \;
./conf.d/acl/30_exim4-config_check_rcpt:  # the black list. See /usr/share/doc/exim4-config/default_acl for details.
./conf.d/acl/30_exim4-config_check_rcpt:  # the black list. See /usr/share/doc/exim4-config/default_acl for details.
./conf.d/acl/20_exim4-config_whitelist_local_deny:# black list. See /usr/share/doc/exim4-config/default_acl for details.
./exim4.conf.template:# black list. See /usr/share/doc/exim4-config/default_acl for details.
./exim4.conf.template:  # the black list. See /usr/share/doc/exim4-config/default_acl for details.
./exim4.conf.template:  # the black list. See /usr/share/doc/exim4-config/default_acl for details.