Remove most doxygen file-level commands, copyrights, and authors

Remove the \file directive, as it is always superfluous  because the
current file is implicit [1]:

> If the file name is omitted (i.e. the line after \file is left blank)
> then the documentation block that contains the \file command will belong
> to the file it is located in.

Author names and e-mails are not relevant for us: it can always be
inferred from git blame, and is often outdated.

Eurecom code has been contributed and was under OAI PL v1.0/v1.1.

For the cpack package contact: put generic email address that is
independent of an individual and that will remain reachable.

[1] https://www.doxygen.nl/manual/commands.html#cmdfile

openair1/PHY/MODULATION/beamforming.c

@@ -19,29 +19,6 @@
  *      contact@openairinterface.org
  */
 
-/*! \file PHY/MODULATION/beamforming.c
- * \brief 
- * \author X. JIANG, F. Kaltenberger, R. KNOPP
- * \date 2016
- * \version 0.1
- * \company Eurecom
- * \email: xiwen.jiang@eurecom.fr,florian.kaltenberger@eurecom.fr,raymond.knopp@eurecom.fr
- * \note
- * \warning
- */
- 
- /*! \function beam_precoding_one_eNB
- * \brief Create and Implementation of beamforming in one eNB
- * \author TY Hsu, SY Yeh(fdragon), TH Wang(Judy)
- * \date 2018
- * \version 0.1
- * \company ISIP@NCTU and Eurecom
- * \email: tyhsu@cs.nctu.edu.tw,fdragon.cs96g@g2.nctu.edu.tw,Tsu-Han.Wang@eurecom.fr
- * \note
- * \warning
- */
-
- 
 #include "PHY/defs_common.h"
 #include "PHY/defs_eNB.h"
 #include "PHY/CODING/coding_defs.h"