hpost: dont emit /bin/hpost but just hpost

just emiting "hpost" makes it simpler to override it as a
rc function.

rc/bin/hpost

@@ -1,13 +1,12 @@
 #!/bin/rc
 rfork e
-argv0=$0
 url=()
 at=()	# text fields
 af=()	# file fields
 l=()
 
 fn usage {
-	echo usage: $argv0 '[ -l ] [ -[gpm] action ] [ -u ] url [ field:value | field@file ... ]' >[1=2]
+	echo 'usage: hpost [ -l ] [ -[gpm] action ] [ -u ] url [ field:value | field@file ... ]' >[1=2]
 	exit usage
 }
 
@@ -41,7 +40,7 @@ while(! ~ $#* 0){
 	shift
 }
 
-hpost=($argv0 $l)
+hpost=(hpost $l)
 
 fn uenc {
 	f=$1

sys/man/1/hget

@@ -204,7 +204,7 @@ edited and sent.
 .IP
 .EX
 % hpost http://p.intma.in
-/bin/hpost -u http://p.intma.in -p paste.cgi text:
+hpost -u http://p.intma.in -p paste.cgi text:
 .EE
 .PP
 Manually specify fields to be sent to a given