s390/kvm: Improve Kconfig help text.

CONFIG_S390_GUEST determines whether virtio guest drivers are built, and
the virtio console is not enforced as default.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/Kconfig

@@ -634,16 +634,17 @@ source "arch/s390/kvm/Kconfig"
 
 config S390_GUEST
 	def_bool y
-	prompt "s390 guest support for KVM (EXPERIMENTAL)"
+	prompt "s390 support for virtio devices (EXPERIMENTAL)"
 	depends on 64BIT && EXPERIMENTAL
 	select VIRTUALIZATION
 	select VIRTIO
 	select VIRTIO_RING
 	select VIRTIO_CONSOLE
 	help
+	  Enabling this option adds support for virtio based paravirtual device
+	  drivers on s390.
+
 	  Select this option if you want to run the kernel as a guest under
-	  the KVM hypervisor. This will add detection for KVM as well  as a
-	  virtio transport. If KVM is detected, the virtio console will be
-	  the default console.
+	  the KVM hypervisor.
 
 endmenu