man: minor: astraceroute: add .PPs

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
man: minor: flowtop: add .PPs

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
man: minor: trafgen: add .PPs and modify BUGS section

Minor change in BUGS section to bring it up to date.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>