vt: Drop a no longer true comment.

Some guy went on a patching spree, adding 24-bit colour support all around:
https://gist.github.com/XVilka/8346728Signed-off-by: NAdam Borowski <kilobyte@angband.pl>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/vt.c

@@ -1313,11 +1313,11 @@ static int vc_t416_color(struct vc_data *vc, int i,
 		return i;
 
 	if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
-		/* 256 colours -- ubiquitous */
+		/* 256 colours */
 		i++;
 		rgb_from_256(vc->vc_par[i], &c);
 	} else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
-		/* 24 bit -- extremely rare */
+		/* 24 bit */
 		c.r = vc->vc_par[i + 1];
 		c.g = vc->vc_par[i + 2];
 		c.b = vc->vc_par[i + 3];