Merge pull request NginxProxyManager#948 from GurjinderSingh/patch-1

Update README.md

Author: jc21

docs/advanced-config/README.md

@@ -132,6 +132,7 @@ NPM has the ability to include different custom configuration snippets in differ
 You can add your custom configuration snippet files at `/data/nginx/custom` as follow:
 
  - `/data/nginx/custom/root.conf`: Included at the very end of nginx.conf
+ - `/data/nginx/custom/http_top.conf`: Included at the top of the main http block
  - `/data/nginx/custom/http.conf`: Included at the end of the main http block
  - `/data/nginx/custom/stream.conf`: Included at the end of the main stream block
  - `/data/nginx/custom/server_proxy.conf`: Included at the end of every proxy server block