KVM: Documentation: Fix index for KVM_CAP_PPC_DAWR1

It should be 7.23 instead of 7.22, which has already been taken by
KVM_CAP_X86_BUS_LOCK_EXIT.
Signed-off-by: NKai Huang <kai.huang@intel.com>
Message-Id: <20210226094832.380394-1-kai.huang@intel.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Documentation/virt/kvm/api.rst

@@ -6181,7 +6181,7 @@ the bus lock vm exit can be preempted by a higher priority VM exit, the exit
 notifications to userspace can be KVM_EXIT_BUS_LOCK or other reasons.
 KVM_RUN_BUS_LOCK flag is used to distinguish between them.
 
-7.22 KVM_CAP_PPC_DAWR1
+7.23 KVM_CAP_PPC_DAWR1
 ----------------------
 
 :Architectures: ppc