Update src/util.h

Co-authored-by: Tobias Nießen <tniessen@tnie.de>

src/util.h

@@ -511,7 +511,7 @@ class ArrayBufferViewContents {
 
  private:
   // Declaring operator new and delete as deleted is not spec compliant.
-  // Therefore declare them private instead to disable dynamic alloc
+  // Therefore, declare them private instead to disable dynamic alloc.
   void* operator new(size_t size);
   void* operator new[](size_t size);
   void operator delete(void*, size_t);