Suggestion documentation update LDAP_USER_FILTER in docker-compose.yml

[col-panic]

In the LDAP Configuration page, the LDAP_USER_FILTER=(&(uid=${user})) parameter is mentioned. I would appreciate a note, that if one embeds this into a docker-compose.yml file, it has to be written like this

LDAP_USER_FILTER=(&(uid=$${user})) in order to escape the ${user} variable.

This is documented in https://stackoverflow.com/a/40619627/905817

[ssddanbrown]

Thanks for the suggestion @col-panic and sorry for my late reply. I've now added a note to that option, in 8238edc, just in the comment as part of the option list.