Edit user identifier example (domain.com → example.com)

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

roles/custom/matrix-dimension/defaults/main.yml

@@ -16,7 +16,7 @@ matrix_dimension_path_prefix: /
 # For information on how to acquire an access token, visit https://t2bot.io/docs/access_tokens
 matrix_dimension_access_token: ""
 
-# Users in form: ['@user1:domain.com', '@user2:domain.com']
+# Users in form: ['@user1:example.com', '@user2:example.com']
 matrix_dimension_admins: []
 
 # Whether to allow Dimension widgets serve websites with invalid or self signed SSL certificates