docs: add comment

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---

Author: kgryte

lib/node_modules/@stdlib/net/disposable-http-server/lib/main.js

@@ -194,7 +194,10 @@ function httpServer( options ) {
 		}
 		debug( 'Server started.' );
 		server = _server;
+
+		// Track connections so that we can perform clean-up upon closing the server of any persistent TCP connections which are still hanging around:
 		server.on( 'connection', onConnection );
+
 		server.once( 'close', onClose );
 		if ( opts.open ) {
 			addr = server.address();