message: [XLA] Correctly state Euler's reflection formula for the gamma function.
  Comment-only change, the code appears correct.
  See
diff: @@ -184,8 +184,8 @@ XlaOp Lgamma(XlaOp input) {
  XlaOp base_lanczos_coeff = ScalarLike(input, kBaseLanczosCoeff);
  - // If the input is less than 0.5 use Gauss's reflection formula:
  - // gamma(x) = pi / sin(pi * x) * gamma(1 - x)
  + // If the input is less than 0.5 use Euler's reflection formula:
  + // gamma(x) = pi / (sin(pi * x) * gamma(1 - x))
  XlaOp need_to_reflect = Lt(Real(input), one_half);
  XlaOp z = Select(need_to_reflect, -input, input - one);
  @@ -237,7 +237,7 @@ XlaOp Digamma(XlaOp input) {
  XlaOp base_lanczos_coeff = ScalarLike(input, kBaseLanczosCoeff);
  - // If the input is less than 0.5 use Gauss's reflection formula:
  + // If the input is less than 0.5 use Euler's reflection formula:
  // digamma(x) = digamma(1 - x) - pi * cot(pi * x)
  XlaOp need_to_reflect = Lt(Real(input), one_half);
  XlaOp z = Select(need_to_reflect, -input, input - one);
  