KVM: nVMX: Document priority of all known events on Intel CPUs

Add a gigantic comment above vmx_check_nested_events() to document the
priorities of all known events on Intel CPUs.  Intel's SDM doesn't
include VMX-specific events in its "Priority Among Concurrent Events",
which makes it painfully difficult to suss out the correct priority
between things like Monitor Trap Flag VM-Exits and pending #DBs.

Kudos to Jim Mattson for doing the hard work of collecting and
interpreting the priorities from various locations throughtout the SDM
(because putting them all in one place in the SDM would be too easy).

Cc: Jim Mattson <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: Maxim Levitsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Bonzini <[email protected]>

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