Correct file name

[jthoward64]

Documentation uses an old file name

Updates all occurrences of settings.json to profiles.json

PR Checklist

• [x ] CLA signed. If not, go over here and sign the CLA
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan.

[DHowett-MSFT]

Thanks. We actually just renamed it to settings.json, and this documentation is on the master (unreleased) branch.