sidecar: Mention it solves jobs with sidecars
sidecar: Mention it solves jobs with sidecars

This was suggested by Sergey here:
	https://github.com/kubernetes/enhancements/pull/1913#discussion_r463894356

Sadly, that branch is merged and can't click on commit suggestion now.
Credits goes to Sergey anyways :-)

Signed-off-by: Rodrigo Campos <6dfa9cecb562e345739f2e4eb69e9ebd0fbff687@kinvolk.io>

kubernetes/enhancements,kubernetes/enhancements,kubernetes/enhancements