[OpenSIPS-Devel] [OpenSIPS/opensips] bbddec: rtpengine: Fix docs for `extra_id_pv`

[Liviu Chircu]

  Branch: refs/heads/2.4
  Home:   https://github.com/OpenSIPS/opensips
  Commit: bbddec52dfe27302973f43adde7f80e657acfd4a
      https://github.com/OpenSIPS/opensips/commit/bbddec52dfe27302973f43adde7f80e657acfd4a
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2020-08-27 (Thu, 27 Aug 2020)

  Changed paths:
    M modules/rtpengine/doc/rtpengine_admin.xml

  Log Message:
  -----------
  rtpengine: Fix docs for `extra_id_pv`

Suggested by Nick Altmann

(cherry picked from commit 968063d9f3d652e94c2895d9dee46b7843c875b5)