[pkg-apparmor] Bug#924450: Bug#924450: Bug#924450: apparmor: Write Buster release notes snippet about AppArmor

[intrigeri]

Christian Boltz:
> AFAIK [1] support for enforcing network rules is not available in Debian 
> yet, therefore it's probably a good idea to remove the "network" part 
> from the text.

Indeed. FWIW apparmor.d(5) was patched in Debian to read:

       Some features are not supported on Debian yet:

       Network Rules
       DBus rules
       Unix socket rules

Cheers,
-- 
intrigeri