redhat/Makefile: BUILD_TARGET fixes

Prarit Bhargavarequested to merge
prarit/kernel-ark:BUILD_TARGET_20220719 into os-build

Update the BUILD_TARGET for dist-brew and eln. Also update the
documentation as 'make dist-brew' should work everywhere.

Signed-off-by: Prarit Bhargava prarit@redhat.com

Edited by Prarit Bhargava

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