Make comments match the code. No functional change.

usr.sbin/bhyve/pci_fbuf.c

@@ -55,7 +55,7 @@ __FBSDID("$FreeBSD$");
  * BAR0 points to the current mode information.
  * BAR1 is the 32-bit framebuffer address.
  *
- *  -s <b>,fbuf,wait,tcp=<ip>:port,w=width,h=height
+ *  -s <b>,fbuf,wait,vga=on|io|off,rfb=<ip>:port,w=width,h=height
  */
 
 static int fbuf_debug = 1;

usr.sbin/bhyve/pci_xhci.c

@@ -28,7 +28,7 @@
     -s <n>,xhci,{devices}
 
    devices:
-     ums             USB tablet mouse
+     tablet             USB tablet mouse
  */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");