Update docker support for s390x

[prabhav-thali]

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[prabhav-thali]

Hi @dvdksn, Why was this PR closed?

[dvdksn]

@prabhav-thali sorry, my mistake

[prabhav-thali]

@dvdksn No issues! Could you please guide me on failed PR checks?

[dvdksn]

Taking a look 👀

[dvdksn]

OK, deploy preview is live now. Something failed on Netlify's side.

[dvdksn]

The third bullet in the prerequisites below this still talks about SLES. I guess we can remove the last sentence.

docs/content/manuals/engine/storage/drivers/btrfs-driver.md

Lines 36 to 41 in c8f9788

	- `btrfs` requires a dedicated block storage device such as a physical disk. This
	block device must be formatted for Btrfs and mounted into `/var/lib/docker/`.
	The configuration instructions below walk you through this procedure. By
	default, the SLES `/` filesystem is formatted with Btrfs, so for SLES, you do
	not need to use a separate block device, but you can choose to do so for
	performance reasons.

[prabhav-thali]

It was present even before the doc was updated for s390x support. Hence, kept the same. But yes, we can remove it.