Fix Caddy example config for Dimension

examples/caddy/matrix-dimension

@@ -3,7 +3,7 @@ https://dimension.DOMAIN {
 	# If you wish to use Caddy's built-in Let's Encrypt support, you can also supply an email address here
 	tls /matrix/ssl/config/live/dimension.DOMAIN/fullchain.pem /matrix/ssl/config/live/dimension.DOMAIN/privkey.pem
 
-	proxy / http://127.0.0.1:8134/ {
+	proxy / http://127.0.0.1:8184/ {
 		transparent
 	}
 }