Update roles/custom/matrix-authentication-service/tasks/syn2mas.yml: fix punctuation

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

roles/custom/matrix-authentication-service/tasks/syn2mas.yml

@@ -106,7 +106,7 @@
 # See: https://ansibledaily.com/print-to-standard-output-without-escaping/
 #
 # We want to run `debug: msg=".."`, but that dumps it as JSON and escapes double quotes within it,
-# which ruins the command (`matrix_authentication_service_syn2mas_migration_command`)
+# which ruins the command (`matrix_authentication_service_syn2mas_migration_command`).
 - name: Note about syn2mas migration
   ansible.builtin.set_fact:
     dummy: true