KVM: VMX: Fix comment of handle_vmx_instruction()

Fix a goof in handle_vmx_instruction()'s comment where it references the
non-existent nested_vmx_setup(); the function that overwrites the exit
handlers is nested_vmx_hardware_setup().

Note, this isn't a case of a stale comment, e.g. due to the function being
renamed.  The comment has always been wrong.

Fixes: e4027cf ("KVM: nVMX: Set callbacks for nested functions during hardware setup")
Signed-off-by: Gao Shiyuan <gaoshiyuan@baidu.com>
Link: https://lore.kernel.org/r/20250103153814.73903-1-gaoshiyuan@baidu.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: Gao Shiyuan

arch/x86/kvm/vmx/vmx.c

@@ -6050,7 +6050,7 @@ static int handle_preemption_timer(struct kvm_vcpu *vcpu)
 
 /*
  * When nested=0, all VMX instruction VM Exits filter here.  The handlers
- * are overwritten by nested_vmx_setup() when nested=1.
+ * are overwritten by nested_vmx_hardware_setup() when nested=1.
  */
 static int handle_vmx_instruction(struct kvm_vcpu *vcpu)
 {