KVM: x86: Fix hypercalls docs section number order

Commit 4180bf1b655a79 ("KVM: X86: Implement "send IPI" hypercall")
documents KVM_HC_SEND_IPI hypercall, yet its section number duplicates
KVM_HC_CLOCK_PAIRING one (which both are 6th). Fix the numbering order
so that the former should be 7th.

Fixes: 4180bf1b655a ("KVM: X86: Implement "send IPI" hypercall")
Signed-off-by: Bagas Sanjaya <[e-mail]>
Reviewed-by: Randy Dunlap <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sean Christopherson <[e-mail]>

Documentation/virt/kvm/x86/hypercalls.rst

···
 Returns KVM_EOPNOTSUPP if the host does not use TSC clocksource,
 or if clock type is different than KVM_CLOCK_PAIRING_WALLCLOCK.
 
-6. KVM_HC_SEND_IPI
+7. KVM_HC_SEND_IPI
 ------------------
 
 :Architecture: x86
···
 
 Returns the number of CPUs to which the IPIs were delivered successfully.
 
-7. KVM_HC_SCHED_YIELD
+8. KVM_HC_SCHED_YIELD
 ---------------------
 
 :Architecture: x86
···
 :Usage example: When sending a call-function IPI-many to vCPUs, yield if
 	        any of the IPI target vCPUs was preempted.
 
-8. KVM_HC_MAP_GPA_RANGE
+9. KVM_HC_MAP_GPA_RANGE
 -------------------------
 :Architecture: x86
 :Status: active