Typo fix in config sample

misc/nginx.conf

@@ -91,7 +91,7 @@ http {
             push_stream_broadcast_channel_prefix        "broad_";
             push_stream_broadcast_channel_max_qtd       3;
 
-            # solving some leakage problem with persitent connections in
+            # solving some leakage problem with persistent connections in
             # Nginx's chunked filter (ngx_http_chunked_filter_module.c)
             chunked_transfer_encoding                   off;
         }