docs: update HOWTO for 3.x -> 4.x versioning
docs: update HOWTO for 3.x -> 4.x versioning

The HOWTO document needed updating for the new kernel versioning.

Signed-off-by: Mario Carrillo <962470f5d16f97233f38b7e7baf23f990a7fbec3@intel.com>
Signed-off-by: Jonathan Corbet <b2ce64d5587c02f12e367eac59751145a0660c51@lwn.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs