Quickstarts readme refers to deleted quickstart

[ldimaggi@ldimaggi jboss-eap-6.1]$ grep -r helpdesk *
quickstarts/switchyard/README.md:* _helpdesk_ : an example web application demonstrating features of BPM and SOAP.

We removed the helpdesk quickstart in https://bugzilla.redhat.com/show_bug.cgi?id=1037671