Improve doc on CICS on z/OS pre-reqs

[armstro]

Create profile https://github.com/zowe/vscode-extension-for-cics#create-profile states ...The connection must point to a CICS region's CICS Management Client Interface (CMCI) TCP/IP host name and port number. The region can be a WUI server in a CICSPlex, or else a stand-alone Single Management Application Programming (SMSS) region. Would be helpful to make the CICS z/OS pre-reqs more visible (feedback from CICS BP conference).

[github-actions]

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