[cleanup] fix comment in builtins-typedarray.cc

It's supposed to be a JSTypedArray, not a JSGeneratorObject

BUG=
R=littledan@chromium.org, adamk@chromium.org, jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2674133002
Cr-Commit-Position: refs/heads/master@{#42967}

src/builtins/builtins-typedarray.cc

@@ -56,7 +56,7 @@ void Generate_TypedArrayPrototypeGetter(compiler::CodeAssemblerState* state,
 
   assembler.Bind(&if_receiverisincompatible);
   {
-    // The {receiver} is not a valid JSGeneratorObject.
+    // The {receiver} is not a valid JSTypedArray.
     Node* result = assembler.CallRuntime(
         Runtime::kThrowIncompatibleMethodReceiver, context,
         assembler.HeapConstant(assembler.factory()->NewStringFromAsciiChecked(