KVM x86 Documentation updates for 6.7:

 - Fix various typos, notably a confusing reference to the non-existent
   "struct kvm_vcpu_event" (the actual structure is kvm_vcpu_events, plural).

 - Update x86's kvm_mmu_page documentation to bring it closer to the code
   (this raced with the removal of async zapping and so the documentation is
   already stale; my bad).

 - Document the behavior of x86 PMU filters on fixed counters.