convert: use field list instead of option list in help
Use field list instead of option list in convert help, because the
option list format used, with defaults and type of argument is not
supported by docutils.
$ hg clone http://localhost:$HGPORT/ copy
abort: error: Connection refused
[255]
$ test -d copy || echo copy: No such file or directory
copy: No such file or directory
$ cat > dumb.py <<EOF
> import BaseHTTPServer, SimpleHTTPServer, os, signal
> def run(server_class=BaseHTTPServer.HTTPServer,
> handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
> server_address = ('localhost', int(os.environ['HGPORT']))
> httpd = server_class(server_address, handler_class)
> httpd.serve_forever()
> signal.signal(signal.SIGTERM, lambda x: sys.exit(0))
> run()
> EOF
$ python dumb.py 2>/dev/null &
$ echo $! >> $DAEMON_PIDS
give the server some time to start running
$ sleep 1
$ hg clone http://localhost:$HGPORT/foo copy2 2>&1
abort: HTTP Error 404: * (glob)
[255]
$ kill $!