docs, backlog adjustment

src/network.c

@@ -84,6 +84,10 @@ void delete_server(Server *s) {
 }
 
 int serve(Server *s, int backlog_size) {
+    if (backlog_size == 0) {
+        backlog_size = DEFAULT_BACKLOG;
+    }
+
     if (listen(s->fd, backlog_size) != 0) {
         return 1;
     }