[doc] 4.2.1 CPU Mitigations - explain how to do this via grub settings about doc-ses HOT 7 CLOSED

Martin is right, the appendix-a needs to reflect mitigations=off vs the individual callouts.

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Yes, what Martin suggests is fine

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@Martin-Weiss could you please be more verbose as to what you're expecting here?

Why do we need grub settings instructions? What is the bug prompting this change in the steps?

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Maybe it is sufficient to refer to https://www.suse.com/support/kb/doc/?id=000019439 and explain the changes in https://documentation.suse.com/ses/6/single-html/ses-tuning/#tuning-appendix-a

(not all the servers in a SES cluster might be salt minions and not every customer is familiar with creating and adjusting salt states)

P.S. https://documentation.suse.com/ses/6/single-html/ses-tuning/#tuning-appendix-a seems to be outdated regarding the mitigation settings..

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Aside from referencing the product documentation (which I found available, here for future reference: https://documentation.suse.com/sles/15-SP1/single-html/SLES-deployment/#sec-boot-parameters-advanced-cpu-mitigations )

I think I would need to see what changes your expecting in the example. My understanding is that we alter the steps to say:

1. Set mitigations=off in the grub2.cfg by adjusting /etc/default/grub and executing grub2-install. For more information see (the link above to the SLES information on cpu mitigation)
2. Reboot.
3. Create directory named my_kerntune in /srv/salt/.
   .... Continue as normal.

@dmbyte @Martin-Weiss ?

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Yes - that is fine for me. Just the reference to the salt state is what I would not add as "mandatory 3." - I would more call it "please find an example for a salt state adjusting the grub2 config in appendix...".

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@dmbyte let me know if that's correct and I'll go ahead :) thanks!

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