Console is utf-8 by default

The console is now by default in UTF-8 mode. Fix the documentation on
the default value, so that we can explain behaviour that otherwise
causes bug-reports like this:

http://bugzilla.kernel.org/show_bug.cgi?id=9319

Also add the needed "vt." prefix, so that the boot-time config options
to switch back to the legacy 8-bit mode is actually documented
correctly.

Signed-off-by: Samuel Thibault <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

Documentation/kernel-parameters.txt

···
 			Format: <area>[,<node>]
 			See also Documentation/networking/decnet.txt.
 
-	default_blu=	[VT]
+	vt.default_blu=	[VT]
 			Format: <blue0>,<blue1>,<blue2>,...,<blue15>
 			Change the default blue palette of the console.
 			This is a 16-member array composed of values
 			ranging from 0-255.
 
-	default_grn=	[VT]
+	vt.default_grn=	[VT]
 			Format: <green0>,<green1>,<green2>,...,<green15>
 			Change the default green palette of the console.
 			This is a 16-member array composed of values
 			ranging from 0-255.
 
-	default_red=	[VT]
+	vt.default_red=	[VT]
 			Format: <red0>,<red1>,<red2>,...,<red15>
 			Change the default red palette of the console.
 			This is a 16-member array composed of values
 			ranging from 0-255.
 
-	default_utf8=   [VT]
+	vt.default_utf8=
+			[VT]
 			Format=<0|1>
 			Set system-wide default UTF-8 mode for all tty's.
-			Default is 0 and by setting to 1, it enables UTF-8
-			mode for all newly opened or allocated terminals.
+			Default is 1, i.e. UTF-8 mode is enabled for all
+			newly opened terminals.
 
 	dhash_entries=	[KNL]
 			Set number of hash buckets for dentry cache.