[OpenSIPS-Devel] [OpenSIPS/opensips] 980bd1: [exec] improve docs on exec async + launch

[Bogdan Andrei IANCU]

  Branch: refs/heads/3.0
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 980bd163b06c2d293e4d25e4d9855c5a73447aa8
      https://github.com/OpenSIPS/opensips/commit/980bd163b06c2d293e4d25e4d9855c5a73447aa8
  Author: Bogdan-Andrei Iancu <bogdan at opensips.org>
  Date:   2020-04-16 (Thu, 16 Apr 2020)

  Changed paths:
    M modules/exec/doc/exec_admin.xml

  Log Message:
  -----------
  [exec] improve docs on exec async + launch

Related to #2049

(cherry picked from commit bb7afdc2dc4363f24d8e28e00ab337c7c174d1e5)