Fix a bug in the man script by bringing it up to date
wrt plan9 sources.

Reference: /n/patches.lsub.org/patch/mansecs
Date: Tue Apr 17 13:00:30 CES 2012
Signed-off-by: nemo@lsub.org

--- /rc/bin/man	Thu Apr 12 12:24:34 2012
+++ /rc/bin/man	Tue Apr 17 12:59:46 2012
@@ -59,7 +59,7 @@
 search=yes
 while(~ $d 0) {
 	if(~ $#* 0) {
-		echo 'Usage: man [-bntpPSw] [sec] [sec] ... name1 name2 ...' >[1=2]
+		echo 'Usage: man [-bntpPSw] [0-9] [0-9] ... name1 name2 ...' >[1=2]
 		exit
 	}
 	if(test -d $S/$1){
@@ -79,7 +79,7 @@
 		}
 }
 if(~ $#sec 0) {
-	sec=`{ls -pd $S/[0-9]* $S/[1-9][0-9]*}
+	sec=`{ls -pd $S/[0-9]* }
 }
 ix=$S/$sec/INDEX
 if(~ $#* 1) pat='^'^$1^' '