message: Change documentation comment type
diff: #include "catch.hpp"
  -// MFEM_Approx can be used to compare floating point values within an absolute
  -// tolerance of `margin` (default value 1e-12).
  +/// MFEM_Approx can be used to compare floating point values within an absolute
  +/// tolerance of `margin` (default value 1e-12).
  inline Approx MFEM_Approx(double val, double margin = 1e-12)
  {
  return Approx(val).margin(margin);
  