KVM: Documentation: Fix omission in struct kvm_vcpu_events

The header file indicates that there are 36 reserved bytes at the end
of this structure. Adjust the documentation to agree with the header
file.
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Documentation/virtual/kvm/api.txt

@@ -873,6 +873,7 @@ struct kvm_vcpu_events {
 		__u8 smm_inside_nmi;
 		__u8 latched_init;
 	} smi;
+	__u32 reserved[9];
 };
 
 Only two fields are defined in the flags field: