*: BB_BANNER -> bb_banner (it is not a const or #define)!
correct_password: explain in detail why it is ok to use bb_banner
fsck_minix: make it print bb version, not it's own (outdated/irrelevant) one

Marginal size difference:
   text    data     bss     dec     hex filename
 679119    2700   15632  697451   aa46b busybox_old
 679091    2700   15632  697423   aa44f busybox_unstripped


diff --git a/shell/ash.c b/shell/ash.c
index 173beb1..35eec42 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -7737,16 +7737,16 @@
 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
 	if (is_interactive > 1) {
 		/* Looks like they want an interactive shell */
-		static smallint do_banner;
+		static smallint did_banner;
 
-		if (!do_banner) {
+		if (!did_banner) {
 			out1fmt(
 				"\n\n"
-				"%s Built-in shell (ash)\n"
+				"%s built-in shell (ash)\n"
 				"Enter 'help' for a list of built-in commands."
 				"\n\n",
-				BB_BANNER);
-			do_banner = 1;
+				bb_banner);
+			did_banner = 1;
 		}
 	}
 #endif