nginxのサンプルにコメント追加 (#7113)

docs/examples/misskey.nginx

@@ -50,11 +50,13 @@ server {
     location / {
         proxy_pass http://127.0.0.1:3000;
         proxy_set_header Host $host;
+        proxy_http_version 1.1;
+        proxy_redirect off;
+
+        # If it's behind another reverse proxy or CDN, remove the following.
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto https;
-        proxy_http_version 1.1;
-        proxy_redirect off;
 
         # For WebSocket
         proxy_set_header Upgrade $http_upgrade;