Fix socks example using test-browser

main.go

@@ -57,7 +57,8 @@ body { background: white; }
   <h4>SOCKS proxy connection</h4>
 
   <pre>ssh -nN -L 9051:{{.SocksIP}}:9051 {{.Hostname}} &
-export https_proxy=localhost:9051
+# test-browser from ai3/testbed
+test-browser --proxy=localhost:9051 https://...
 </pre>
 
 </body>