KVM: selftests: Fix spelling mistake "begining" -> "beginning"

There is a spelling mistake in an assert message. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20220928213458.64089-1-colin.i.king@gmail.com


[sean: fix an ironic typo in the changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>