message: Remove some stale comments.
diff: @@ -27,9 +27,7 @@ namespace ruy {
  // Performs a multiplication of matrices. This is Ruy's only API entry point.
  // Should be self-explanatory given the above documentation for each of Matrix,
  -// Spec and Context. See reference code in reference.h, with the caveat that
  -// that is reference code for transpose-multiply (TrMul) not just multiply;
  -// see the translation between the two in transpose_dispatch.h.
  +// Spec and Context.
  template <Path CompiledPaths, typename LhsScalar, typename RhsScalar,
  typename DstScalar, typename Spec>
  void Mul(const Matrix<LhsScalar>& lhs, const Matrix<RhsScalar>& rhs,
  