Read Only Admin REST example is deprecated

The example should read:

5.0 Syntax:
curl -X PUT --data "name=<user name>=ro_admin&password=<password>" \
-H "Content-Type: application/x-www-form-urlencoded" \
http://<Admin user>:<password>@%s:8091/settings/rbac/users/local/<username>

Working Example:
curl -X PUT --data "name=John Smith&roles=ro_admin&password=jspassword" \
-H "Content-Type: application/x-www-form-urlencoded" \
http://Administrator:password@127.0.0.1:8091/settings/rbac/users/local/johnsmith

Reporter: Tim Wong
E-mail: tim.wong@couchbase.com