KVM: arm64: nvhe: Fix a non-kernel-doc comment

Do not use kernel-doc "/**" notation when the comment is not in
kernel-doc format.

Fixes this docs build warning:

arch/arm64/kvm/hyp/nvhe/sys_regs.c:478: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Handler for protected VM restricted exceptions.

Signed-off-by: Randy Dunlap <[email protected]>
Reported-by: kernel test robot <[email protected]>
Cc: Fuad Tabba <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: rddunlap

arch/arm64/kvm/hyp/nvhe/sys_regs.c

@@ -474,7 +474,7 @@ bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
 	return true;
 }
 
-/**
+/*
  * Handler for protected VM restricted exceptions.
  *
  * Inject an undefined exception into the guest and return true to indicate that