KVM: VMX: fix comment to add LBR to passthrough MSRs

According to the is_valid_passthrough_msr(), the LBR MSRs are also
passthrough MSRs, since the commit 1b5ac32 ("KVM: vmx/pmu:
Pass-through LBR msrs when the guest LBR event is ACTIVE").

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Link: https://lore.kernel.org/r/20240223202104.3330974-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: Dongli Zhang

arch/x86/kvm/vmx/vmx.c

@@ -159,7 +159,7 @@ module_param(allow_smaller_maxphyaddr, bool, S_IRUGO);
 
 /*
  * List of MSRs that can be directly passed to the guest.
- * In addition to these x2apic and PT MSRs are handled specially.
+ * In addition to these x2apic, PT and LBR MSRs are handled specially.
  */
 static u32 vmx_possible_passthrough_msrs[MAX_POSSIBLE_PASSTHROUGH_MSRS] = {
 	MSR_IA32_SPEC_CTRL,