docs/upgrading/README.md

 ```
     location ~ ^/(client/|_matrix/client/unstable/org.matrix.msc3575/sync) {
         proxy_pass http://10.10.10.7:8008;
-        proxy_set_header X-Forwarded-For \$remote_addr;
-        proxy_set_header X-Forwarded-Proto \$scheme;
-        proxy_set_header Host \$host;
+        proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Host $host;
     }
 ```