Update comment on AnyOf

Author: lukel97

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -1223,8 +1223,8 @@ class VPInstruction : public VPRecipeWithIRFlags,
     // operand). Only generates scalar values (either for the first lane only or
     // for all lanes, depending on its uses).
     PtrAdd,
-    // Returns a scalar boolean value, which is true if any lane of its single
-    // operand is true.
+    // Returns a scalar boolean value, which is true if any lane of its (only
+    // boolean) vector operand is true.
     AnyOf,
   };