[OpenSIPS-Devel] [OpenSIPS/opensips] 1d4aaf: msrp_ua: add missing docs

[Vlad Pătrașcu]

  Branch: refs/heads/3.3
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 1d4aaf141e867cbb0231108154851b162846f342
      https://github.com/OpenSIPS/opensips/commit/1d4aaf141e867cbb0231108154851b162846f342
  Author: Vlad Patrascu <vladp at opensips.org>
  Date:   2022-05-19 (Thu, 19 May 2022)

  Changed paths:
    M modules/msrp_ua/doc/msrp_ua_admin.xml

  Log Message:
  -----------
  msrp_ua: add missing docs

Document the "advertised_contact" module param and the
"msrp_ua_start_session" MI function.

(cherry picked from commit 2d698c3f33d1e24c2a60ce7542d64be233b2127d)