Bug 24402: About template corrections

Bug 24402: About template corrections

With the 20.05 team we introduced and expanded some roles.  This patch
adds support for:

* removal of the release maintainer for development releases
* a list of documentation managers
* a list of packaging manager

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>