[Comment] Update comment of VPVectorPointerRecipe

Author: Mel-Chen

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -1750,7 +1750,8 @@ class VPVectorEndPointerRecipe : public VPRecipeWithIRFlags,
 #endif
 };
 
-/// A recipe to compute the pointers for widened memory accesses of IndexTy.
+/// A recipe to compute the pointers for widened memory accesses of IndexedTy,
+/// with the Stride expressed in units of IndexedTy.
 class VPVectorPointerRecipe : public VPRecipeWithIRFlags,
                               public VPUnrollPartAccessor<2> {
   Type *IndexedTy;