message: Update comment describing dtype map
diff: @@ -45,7 +45,7 @@ const int kRightMargin = 78;
  constexpr char kEagerFallbackSuffix[] = "_eager_fallback";
  -// Dtype enums mapped to dtype classes which is the type of each dtype
  +// Maps C++ dtype enum values to Python DType classes
  const std::unordered_map<string, string> dtype_type {
  {"_dtypes.float16", "_dtypes.Float16"},
  {"_dtypes.half", "_dtypes.Half"},
  