Update path recommendation

If you are on a 20.x release - version support for these versions has ended as of the release date of 23.0.0.

If you are on a 21.x older than 21.9.0:

• 21.x > 21.9.0 > 22.6.2 > 23.3.1

If you are on the release 21.9.0 or newer:

• Upgrade to 22.6.2, then to 23.3.1

If you are on the release 22.6.2 or newer:

• Upgrade directly to 23.3.1