improve documentation and comments

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.626 2013/08/10 13:44:27 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.627 2013/08/10 13:47:16 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -31,7 +31,7 @@
 # http://www.freebsd.org/cgi/cvsweb.cgi/src/tools/regression/bin/test/regress.sh?rev=HEAD
 
 expected-stdout:
-	@(#)MIRBSD KSH R47 2013/08/10
+	@(#)MIRBSD KSH R48 2013/08/10
 description:
 	Check version of shell.
 stdin:
@@ -40,7 +40,7 @@ name: KSH_VERSION
 category: shell:legacy-no
 ---
 expected-stdout:
-	@(#)LEGACY KSH R47 2013/08/10
+	@(#)LEGACY KSH R48 2013/08/10
 description:
 	Check version of legacy shell.
 stdin:

sh.h

@@ -164,9 +164,9 @@
 #endif
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.664 2013/08/10 13:44:33 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.665 2013/08/10 13:47:18 tg Exp $");
 #endif
-#define MKSH_VERSION "R47 2013/08/10"
+#define MKSH_VERSION "R48 2013/08/10"
 
 /* arithmetic types: C implementation */
 #if !HAVE_CAN_INTTYPES