Fix variable typos

group_vars/matrix_servers

@@ -31,7 +31,7 @@ matrix_playbook_docker_installation_enabled: true
 #                                                                      #
 ########################################################################
 
-matrix_homeserver_app_service_config_files_auto: |
+matrix_homeserver_container_extra_arguments_auto: |
   {{
     (['--mount type=bind,src=' + matrix_appservice_discord_config_path + '/registration.yaml,dst=/matrix-appservice-discord-registration.yaml,ro'] if matrix_appservice_discord_enabled else [])
     +
@@ -86,7 +86,7 @@ matrix_homeserver_app_service_config_files_auto: |
     (['--mount type=bind,src=' + matrix_cactus_comments_app_service_config_file + ',dst=/matrix-cactus-comments.yaml,ro'] if matrix_cactus_comments_enabled else [])
   }}
 
-matrix_homeserver_additional_config_files_auto: |
+matrix_homeserver_app_service_config_files_auto: |
   {{
     (['/matrix-appservice-discord-registration.yaml'] if matrix_appservice_discord_enabled else [])
     +