docs: cleanup proxy plugin headers

docs/networking/proxies/nginx.md

@@ -1,4 +1,4 @@
-# Nginx Configuration
+# Nginx Proxy
 
 Dokku uses nginx as its server for routing requests to specific applications. By default, access and error logs are written for each app to `/var/log/nginx/${APP}-access.log` and `/var/log/nginx/${APP}-error.log` respectively
 

docs/networking/proxies/traefik.md

@@ -1,4 +1,4 @@
-# Traefik Configuration
+# Traefik Proxy
 
 Dokku provides integration with the [Traefik](https://traefik.io/) proxy service by utilizing the Docker label-based integration implemented by Traefik.