Update docs/configuring-playbook-matrix-ldap-registration-proxy.md: change placeholders

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-matrix-ldap-registration-proxy.md

@@ -14,11 +14,12 @@ To enable the component, add the following configuration to your `inventory/host
 
 ```yaml
 matrix_ldap_registration_proxy_enabled: true
+
 # LDAP credentials
-matrix_ldap_registration_proxy_ldap_uri: <URI>
-matrix_ldap_registration_proxy_ldap_base_dn: <DN>
-matrix_ldap_registration_proxy_ldap_user: <USER>
-matrix_ldap_registration_proxy_ldap_password: <password>
+matrix_ldap_registration_proxy_ldap_uri: YOUR_URI_HERE
+matrix_ldap_registration_proxy_ldap_base_dn: YOUR_DN_HERE
+matrix_ldap_registration_proxy_ldap_user: YOUR_USER_HERE
+matrix_ldap_registration_proxy_ldap_password: YOUR_PASSWORD_HERE
 ```
 
 If you already use the [synapse external password provider via LDAP](configuring-playbook-ldap-auth.md) (that is, you have `matrix_synapse_ext_password_provider_ldap_enabled: true` and other options in your configuration) you can use the following values as configuration: