docs: ref-system-requirements.rst: update list of supported distros

Add AlmaLinux 8.5, Fedora 35, and OpenSUSE Leap 15.3
Remove Fedora 33, Debian 8, OpenSUSE Leap 15.1 and 15.2

Removing distros that were recently removed from SANITY_TESTED_DISTROS
in meta-poky/conf/distro/poky.conf

(From yocto-docs rev: 734d5db1f166d7722541b25718fb11a12282f0c5)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reported-by: Steve Sakoman <steve@sakoman.com>
Reported-by: Christian Eggers <ceggers@arri.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/system-requirements.rst

@@ -41,15 +41,15 @@ distributions:
 
 -  Ubuntu 20.04 (LTS)
 
--  Fedora 33
-
 -  Fedora 34
 
+-  Fedora 35
+
 -  CentOS 7.x
 
 -  CentOS 8.x
 
--  Debian GNU/Linux 8.x (Jessie)
+-  AlmaLinux 8.5
 
 -  Debian GNU/Linux 9.x (Stretch)
 
@@ -57,9 +57,7 @@ distributions:
 
 -  Debian GNU/Linux 11.x (Bullseye)
 
--  OpenSUSE Leap 15.1
-
--  OpenSUSE Leap 15.2
+-  OpenSUSE Leap 15.3
 
 .. note::