[w3c/manifest] Delete some errant apostrophes. (#592)

Note: I'm not sure whether it should be:
> installation process UI

or

> installation process's UI

but 

> installation process' UI

is not right.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/592

-- Commit Summary --

  * Delete some errant apostrophes
  * run html5 tidy

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/manifest/pull/592.patch
https://github.com/w3c/manifest/pull/592.diff

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