Fix typo in LDAP explanation comment

config/gitlab.yml.example

@@ -128,7 +128,7 @@ production: &base
     bind_dn: '_the_full_dn_of_the_user_you_will_bind_with'
     password: '_the_password_of_the_bind_user'
     # If allow_username_or_email_login is enabled, GitLab will ignore everything
-    # after the first '@' in LDAP the username submitted by the user on login.
+    # after the first '@' in the LDAP username submitted by the user on login.
     # Example:
     # - the user enters 'jane.doe@example.com' and 'p@ssw0rd' as LDAP credentials;
     # - GitLab queries the LDAP server with 'jane.doe' and 'p@ssw0rd'.