[OpenSIPS-Devel] [OpenSIPS/opensips] b113d4: tm: add usage scope in documentation

[Razvan Crainea]

  Branch: refs/heads/2.2
  Home:   https://github.com/OpenSIPS/opensips
  Commit: b113d4eaa6de3ecb44ff277a8d34327c8ddf9d31
      https://github.com/OpenSIPS/opensips/commit/b113d4eaa6de3ecb44ff277a8d34327c8ddf9d31
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2017-01-18 (Wed, 18 Jan 2017)

  Changed paths:
    M modules/tm/README
    M modules/tm/doc/tm_admin.xml

  Log Message:
  -----------
  tm: add usage scope in documentation

Informs users about the scope where the transaction functions should
be used. Should prevent misuse cases, such as #1019 and so.

Thanks go to Ryan Bullock for reporting and documenting this.

(cherry picked from commit 202193bf8b1bf132e39ecf7dc4b7258839ac5ff4)