add {} to not confuse yaml renderer

Author: CodeShellDev

docs/reverse-proxy/caddy/examples/caddy.docker-compose.yaml

@@ -26,7 +26,7 @@ services:
       - secured-signal
 
 networks:
-  backend:
+  backend: {}
 
 volumes:
-  data:
+  data: {}

docs/reverse-proxy/nginx/examples/nginx.docker-compose.yaml

@@ -30,4 +30,4 @@ services:
       backend:
 
 networks:
-  backend:
+  backend: {}

docs/reverse-proxy/traefik/examples/traefik.docker-compose.yaml

@@ -4,10 +4,9 @@ services:
     container_name: secured-signal
     environment:
       API__URL: http://signal-api:8080
-      SETTINGS__VARIABLES__RECIPIENTS:
-        '[+123400002,+123400003,+123400004]'
+      SETTINGS__VARIABLES__RECIPIENTS: "[+123400002,+123400003,+123400004]"
       SETTINGS__VARIABLES__NUMBER: "+123400001"
-      API__TOKENS: '[LOOOOOONG_STRING]'
+      API__TOKENS: "[LOOOOOONG_STRING]"
     labels:
       - traefik.enable=true
       - traefik.http.routers.signal-api.rule=Host(`signal-api.mydomain.com`)
@@ -25,6 +24,6 @@ services:
           - secured-signal-api
 
 networks:
-  backend:
+  backend: {}
   proxy:
     external: true