fix: misspelling on MetaType

Author: NathanWalker

NativeScript/runtime/ArgConverter.mm

@@ -341,7 +341,7 @@
         tns::SetValue(isolate, thiz, wrapper);
         std::shared_ptr<Persistent<Value>> poThiz = ObjectManager::Register(context, thiz);
         cache->Instances.emplace(result, poThiz);
-        // [result retain];
+        [result retain];
     }
 }
 

NativeScript/runtime/Metadata.h

@@ -584,7 +584,7 @@ struct Meta {
             case Vector:
                 return "Vector";
             default:
-                return "Unknwon";
+                return "Unknown";
         }
     }