[heycam/webidl] Update SessionManager example (#421)

Would be happy to update the class string once https://github.com/heycam/webidl/issues/419 is resolved, but submitting this for review first.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/421

-- Commit Summary --

  * Update SessionManager example

-- File Changes --

    M index.bs (36)

-- Patch Links --

https://github.com/heycam/webidl/pull/421.patch
https://github.com/heycam/webidl/pull/421.diff

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https://github.com/heycam/webidl/pull/421