Merge branch 'docs/ldap-location' into 'master'

Change wording for LDAP doc that was moved to a new location

See merge request !1262

doc/integration/ldap.md

-# GitLab LDAP integration
-
-This document was moved under [`administration/auth/ldap`](../administration/auth/ldap.md).
+This document was moved to [`administration/auth/ldap`](../administration/auth/ldap.md).