doc: cgroup: improve formatting of io example

We need a literal section, like few paragraphs below.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lore.kernel.org/r/20200228000653.1572553-4-kuba@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jakub Kicinski 2020-02-27 16:06:51 -08:00 • committed by Jonathan Corbet
commit 69654d37cf