KVM: MMU: document fast invalidate all mmio sptes
KVM: MMU: document fast invalidate all mmio sptes

Document it to Documentation/virtual/kvm/mmu.txt

Signed-off-by: Xiao Guangrong <1e0036c3819c78880ef9e9a8457e99783a5661e3@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <69d3ebcf5ee4e7f05a50dc23cd96655b730804b4@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs