moved description comments to header

ext/tlibs2-mag/mag.h

@@ -3,7 +3,11 @@
  * @author Tobias Weber <tweber@ill.fr>
  * @date 30-may-2020
  * @license GPLv2 or GPLv3, see 'LICENSE' file
- * @desc tlibs forked on 7-Nov-2018 from the privately developed "tlibs" project (https://github.com/t-weber/tlibs).
+ * @desc based on the mathematical formalism of the skyrmion and helimagnon models by M. Garst and J. Waizner, 2016-2020, references:
+ *	- https://doi.org/10.1088/1361-6463/aa7573
+ *	- https://doi.org/10.1038/nmat4223 (supplement)
+ *	- https://kups.ub.uni-koeln.de/7937/
+ * @desc forked on 7-Nov-2018 from my privately developed "tlibs" project (https://github.com/t-weber/tlibs).
  */
 
 #ifndef __TLIBS2_PHYS_MAG__
@@ -39,10 +43,6 @@ namespace tl2 {
 
 /**
  * Calculates energies and dynamical structure factors from Landau-Lifshitz (M x) and fluctuation matrices.
- * Uses the mathematical formalism by M. Garst et al., references:
- * - https://doi.org/10.1088/1361-6463/aa7573
- * - https://doi.org/10.1038/nmat4223 (supplement)
- * - https://kups.ub.uni-koeln.de/7937/
  */
 template<class t_mat_cplx, class t_vec_cplx, class t_cplx, class t_real>
 std::tuple<std::vector<t_cplx>, std::vector<t_vec_cplx>, std::vector<t_mat_cplx>>