Dmitry Tantsur 3199d289bd Fix iPXE docs: snponly is not always available
Actually, it's only available on RHEL/CentOS 8, but I hope the other
distributions will catch up.

Change-Id: I53314b8f16fd7b965c58370e33ab83501e7cb067
2021-07-13 14:43:07 +02:00
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