Replace <matrix-domain> with example.com

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

examples/vars.yml

@@ -1,9 +1,9 @@
 ---
 # The bare domain name which represents your Matrix identity.
-# Matrix user ids for your server will be of the form (`@user:<matrix-domain>`).
+# Matrix user ids for your server will be of the form (`@user:example.com`).
 #
 # Note: this playbook does not touch the server referenced here.
-# Installation happens on another server ("matrix.<matrix-domain>").
+# Installation happens on another server ("matrix.example.com").
 #
 # If you've deployed using the wrong domain, you'll have to run the Uninstalling step,
 # because you can't change the Domain after deployment.

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

@@ -1,10 +1,10 @@
 ---
 
 # The bare domain name which represents your Matrix identity.
-# Matrix user ids for your server will be of the form (`@user:<matrix-domain>`).
+# Matrix user ids for your server will be of the form (`@user:example.com`).
 #
 # Note: this playbook does not touch the server referenced here.
-# Installation happens on another server ("matrix.<matrix-domain>", see `matrix_server_fqn_matrix`).
+# Installation happens on another server ("matrix.example.com", see `matrix_server_fqn_matrix`).
 #
 # Example value: example.com
 matrix_domain: ~