[console] Tidy up config/console.h

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/config/console.h

  *
  * Console configuration
  *
- * These options specify the console types that Etherboot will use for
+ * These options specify the console types that iPXE will use for
  * interaction with the user.
  *
  */
 
 #include <config/defaults.h>
 
-//#define	CONSOLE_PCBIOS		/* Default BIOS console */
-//#define	CONSOLE_SERIAL		/* Serial port */
-//#define	CONSOLE_DIRECT_VGA	/* Direct access to VGA card */
-//#define	CONSOLE_PC_KBD		/* Direct access to PC keyboard */
+/*
+ * Default console types
+ *
+ * These are all enabled by default for the appropriate platforms.
+ * You may disable them if needed.
+ *
+ */
+
+//#undef	CONSOLE_PCBIOS		/* Default BIOS console */
+//#undef	CONSOLE_EFI		/* Default EFI console */
+//#undef	CONSOLE_LINUX		/* Default Linux console */
+
+/*
+ * Additional console types
+ *
+ * These are not enabled by default, but may be useful in your
+ * environment.
+ *
+ */
+
+//#define	CONSOLE_SERIAL		/* Serial port console */
+//#define	CONSOLE_VESAFB		/* VESA framebuffer console */
 //#define	CONSOLE_SYSLOG		/* Syslog console */
 //#define	CONSOLE_SYSLOGS		/* Encrypted syslog console */
 //#define	CONSOLE_VMWARE		/* VMware logfile console */
-//#define	CONSOLE_DEBUGCON	/* Debug port console */
-//#define	CONSOLE_VESAFB		/* VESA framebuffer console */
+//#define	CONSOLE_DEBUGCON	/* Bochs/QEMU/KVM debug port console */
 //#define	CONSOLE_INT13		/* INT13 disk log console */
 
+/*
+ * Very obscure console types
+ *
+ * You almost certainly do not need to enable these.
+ *
+ */
+
+//#define	CONSOLE_DIRECT_VGA	/* Direct access to VGA card */
+//#define	CONSOLE_PC_KBD		/* Direct access to PC keyboard */
+
+/* Keyboard map (available maps in hci/keymap/) */
 #define	KEYBOARD_MAP	us
 
+/* Control which syslog() messages are generated.
+ *
+ * Note that this is not related in any way to CONSOLE_SYSLOG.
+ */
 #define	LOG_LEVEL	LOG_NONE
 
 #include <config/named.h>