[webauthn] Merged Pull Request: Update examples to use current Extensions

ve7jtb has just merged ve7jtb's pull request 1426 for https://github.com/w3c/webauthn:

== Update examples to use current Extensions ==
Update examples.  Remove location and transaction confirmation in favor of appidExclude and credProps extensions


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<a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/pull/1426.html" title="Last updated on May 27, 2020, 8:00 PM UTC (5e89d7a)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/1426/f10427d...5e89d7a.html" title="Last updated on May 27, 2020, 8:00 PM UTC (5e89d7a)">Diff</a>

See https://github.com/w3c/webauthn/pull/1426