Update chart instructions

Fixes openfaas#338 via @feynmanliang - minor improvement to copy/paste
experience of setting up OpenFaaS via helm chart.

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Author: alexellis

chart/openfaas/README.md

@@ -80,7 +80,7 @@ export OPENFAAS_URL=http://...
 Now log in:
 
 ``` bash
-echo -n $PASSWORD | faas-cli login -g http://$OPENFAAS_URL -u admin --password-stdin
+echo -n $PASSWORD | faas-cli login -g $OPENFAAS_URL -u admin --password-stdin
 ```
 
 ## OpenFaaS Operator / CRD controller