Ubuntu 19.04 was released with AppArmor 2.13.2 [0].
Update documentation to hint users that they can use AppArmor profile
with latest AppArmor features on Ubuntu 19.04 release.
[0] https://packages.ubuntu.com/disco/admin/apparmor
AppArmor profile attachement example is wrong because it does not use {
} "alternations" to make comma define alternative executable path.
Update example to make it actually work in custom install prefix case.
security/apparmor/install.sh scripts does not need to `cd` into it's
directory to work correctly.
Simplify example to invoke `install.sh` without `cd`.
