[w3c/manifest] Add note on back button requirements (#687)

This closes #673.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/687

-- Commit Summary --

  * Add note on back button requirements
  * Fix indentation

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/manifest/pull/687.patch
https://github.com/w3c/manifest/pull/687.diff

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