message: Fixed typo in included header.
diff: #include "axom/Types.hpp" // for AXOM_NULLPTR
  #include "axom_utils/Utilities.hpp" // for isNearlyEqual()
  -#include "axom_utils/polynomial_solve.hpp"
  +#include "axom_utils/polynomial_solvers.hpp"
  // C/C++ includes
  #include <cassert> // for assert()
  