Add missing inline documentation strings

#define INCLUDE_LAPACK_CALLS_H_

#ifndef LAPACK_SUCCESS

//! \brief Success code macro for LAPACK functions.

#define LAPACK_SUCCESS 0

#endif

#ifdef USE_MKL

//! \brief Double precision complex for MKL implementation.

typedef MKL_Complex16 lcomplex;

#else

//! \brief Double precision complex for LAPACK implementation.

typedef dcomplex lcomplex;

#endif // USE_MKL

#ifndef INCLUDE_MAGMA_CALLS_H_

#define INCLUDE_MAGMA_CALLS_H_

//! \brief Maximum number of elements on GPU static vectors.

#define MAX_GPU_STACK_DOUBLE 128

#ifdef USE_TARGET_OFFLOAD

using namespace std;

//! \brief Four times PI.

const double four_pi = 8.0 * acos(0.0);

void apc(