Suggest matching max_request_size

docs/deploying/generic.md

@@ -123,9 +123,9 @@ header, making federation non-functional. If using Apache, you need to use
 `nocanon` in your `ProxyPass` directive to prevent this (note that Apache
 isn't very good as a general reverse proxy).
 
-Nginx users may need to increase `client_max_body_size` if there are issues with
-uploading media like images. Set `proxy_request_buffering off;` and
-`proxy_buffering off;` if you prefer not to buffer big files to disk.
+Nginx users need to increase `client_max_body_size` (default is 1M) to match
+`max_request_size` defined in conduwuit.toml. Set `proxy_request_buffering off;`
+and `proxy_buffering off;` if you prefer not to buffer big files to disk.
 
 You will need to reverse proxy everything under following routes:
 - `/_matrix/` - core Matrix C-S and S-S APIs