Documentation: Move 4.20 release notes to 4.20.1

This moves the release notes to 4.20.1, as was done with the 4.8 release
when it went to 4.8.1.  The index.md file is updated for both the 4.20.1
and 4.8.1 releases, and extra spacing was added. This doesn't get shown
in the output, but makes the text version look better.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ic2fb35f1bf9fa7dc16d324882cd6057a1a4b05ed
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75637
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

0 files changed, 0 insertions, 0 deletions