Replace !someRoom with !qporfwt

!qporfwt is used as an example of a room ID on https://spec.matrix.org/v1.12/#room-structure

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

roles/custom/matrix-alertmanager-receiver/defaults/main.yml

@@ -127,7 +127,7 @@ matrix_alertmanager_receiver_config_matrix_access_token: ''
 #
 # Example:
 # matrix_alertmanager_receiver_config_matrix_room:
-#   simple-name: "!someRoom:example.com"
+#   simple-name: "!qporfwt:example.com"
 #   another-name: "!anotherRoom:example.com"
 matrix_alertmanager_receiver_config_matrix_room_mapping: {}