As of 11.9 GitLab supports Google Secure LDAP for authentication
and group sync. This documentation outlines how to configure
the service.

Rename file

Allow raw `tls_options` to be passed in LDAP configuration

Closes #46391

See merge request gitlab-org/gitlab-ce!20678

We've previously exposed ca_file and ssl_version but there are many
possible options that can be used inside tls_options. Instead of
exposing individual ones, simply expose the entire hash so it can
be passed in and we won't have to add things in the future.

Markdown renderers find it easier to determine
where lists start and end when lists are surrounded
by new lines.

For consistency, also ensure entries in the list
are aligned when they span multipls lines.

For the sake of consistency, removes any extraneous
consecutive blank lines from the doc suite.

Update ldap.md If you escape the '\' character when using a "domain\user" scheme for the bind_dn name, it will fail. gitlab-ctl reconfigure escapes characters, and if you pre-escape the '\', the resultant yaml file will have four (4) '\' characters

See merge request gitlab-org/gitlab-ce!20460