chore: update comment

Author: diegomura

apple/RNCWebViewManager.m

@@ -254,7 +254,7 @@ - (BOOL)          webView:(RNCWebView *)webView
   request[@"lockIdentifier"] = @(_shouldStartLoadLock.condition);
   callback(request);
 
-  // Block the main thread for a maximum of 250ms until the JS thread returns
+  // Block the main thread for a maximum of 500ms until the JS thread returns
   if ([_shouldStartLoadLock lockWhenCondition:0 beforeDate:[NSDate dateWithTimeIntervalSinceNow:.50]]) {
     BOOL returnValue = _shouldStartLoad;
     [_shouldStartLoadLock unlock];