[w3c/manifest] Feat(image objects): clarify how to fetch (closes #443) (#459)

 @jakearchibald WIP, let me know if this is ok? 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/459

-- Commit Summary --

  * Feat(image objects): clarify how to fetch (closes #443)

-- File Changes --

    M index.html (33)

-- Patch Links --

https://github.com/w3c/manifest/pull/459.patch
https://github.com/w3c/manifest/pull/459.diff

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