staging: vboxvideo: Kconfig: Fix typos in help text

This fixes typos in vboxvideo's help text. Most notably, "to builtin
this module" becomes "to build this driver built-in to the kernel".
Signed-off-by: NMartin Kepplinger <martink@posteo.de>
Acked-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vboxvideo/Kconfig

@@ -7,7 +7,8 @@ config DRM_VBOXVIDEO
 	  This is a KMS driver for the virtual Graphics Card used in
 	  Virtual Box virtual machines.
 
-	  Although it is possible to builtin this module, it is advised
-	  to build this driver as a module, so that it can be updated
-	  independently of the kernel. Select M to built this driver as a
-	  module and add support for these devices via drm/kms interfaces.
+	  Although it is possible to build this driver built-in to the
+	  kernel, it is advised to build it as a module, so that it can
+	  be updated independently of the kernel. Select M to build this
+	  driver as a module and add support for these devices via drm/kms
+	  interfaces.