[w3c/manifest] doc(extensibility): e.g., of site verificaton (closes #476) (#497)

@RobDolinMS, is this sufficient to close #476 for now? 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/497

-- Commit Summary --

  * doc(extensibility): e.g., of site verificaton (closes #476)

-- File Changes --

    M index.html (3)

-- Patch Links --

https://github.com/w3c/manifest/pull/497.patch
https://github.com/w3c/manifest/pull/497.diff

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