Fixed formatting of Nginx configuration.

doc/NGINX.txt

@@ -1,7 +1,6 @@
-A few notes on Nginx configuration
+## Nginx HTTP server configuration for Spreed WebRTC
 
-  In general Nginx with websocket support is required 
+In general Nginx with websocket support is required (Nginx >= 1.3).
-  (I am using Nginx 1.4). It should work with Nginx 1.3 too.
 
 Add the following to your Nginx server section:
 
@@ -40,7 +39,7 @@ A few notes on Nginx configuration
 	proxy_temp_file_write_size  64k;
 	proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;
 
-  Thats it.
+And thats it.
 
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 (c)2013 struktur AG