x86/microcode: Document the three loading methods

Paul Menzel recently asked how to load microcode on a system and I realized
that we don't really have all the methods written down somewhere.

Do that, so people can go and look them up.

Reported-by: Paul Menzel <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Fix whitespace noise in the new description. ]
Signed-off-by: Ingo Molnar <[email protected]>

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