Merge branch 'mk-fix-ldap-ca-file-docs' into 'master'

Fix LDAP documentation and example config

Closes #35770

See merge request !13196

config/gitlab.yml.example

@@ -282,7 +282,7 @@ production: &base
         #
         #   Example: '/etc/ca.pem'
         #
-        ca_cert: ''
+        ca_file: ''
 
         # Specifies the SSL version for OpenSSL to use, if the OpenSSL default
         # is not appropriate.

doc/administration/auth/ldap.md

@@ -96,7 +96,7 @@ main: # 'main' is the GitLab 'provider ID' of this LDAP server
   #
   #   Example: '/etc/ca.pem'
   #
-  ca_cert: ''
+  ca_file: ''
 
   # Specifies the SSL version for OpenSSL to use, if the OpenSSL default
   # is not appropriate.