config-linux: add example of cgroup resource limits
config-linux: add example of cgroup resource limits

The example section looks very sparse otherwise.

Signed-off-by: Aleksa Sarai <a8eb12d32d6ec07cdf737175ec7d4a0f1b4e1ee7@suse.de>

hqhq/runtime-spec,hqhq/specs,opencontainers/specs,laijs/specs,jonboulle/specs,cloudfoundry-incubator/specs,opencontainers/runtime-spec,wking/opencontainer-runtime-spec,vbatts/specs,ujuc/specs,wking/opencontainer-specs