Correct comment of user id

Signed-off-by: Julian-Samuel Gebühr <julian-samuel@gebuehr.net>

roles/matrix-cactus-comments/templates/cactus_appservice.yaml.j2

@@ -10,7 +10,7 @@ url: "http://matrix-cactus-comments:{{ matrix_cactus_comments_container_port }}"
 as_token: {{ matrix_cactus_comments_as_token | to_json }}
 hs_token: {{ matrix_cactus_comments_hs_token | to_json }}
 
-# User associated with our service. In this case "@cactusbot:example.com"
+# The user id of the cactusbot which can be used to register and moderate sites
 sender_localpart: "{{ matrix_cactus_comments_user_id }}"
 
 namespaces: