subtests.docker_cli.kill: Fix indentation which causes false-positive

The else was missaligned to another branch causing fals-positive results

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
index.rst: Update the docs for the stop test

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>

Conflicts:
	index.rst