[w3c/manifest] Fix(updates): remove text about updates (closes #384) (#457)

Removed the text about updating. Updating probably needs to happen explicitly on request by the developer via some API. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/457

-- Commit Summary --

  * Fix(updates): remove text about updates (closes #384)

-- File Changes --

    M index.html (29)

-- Patch Links --

https://github.com/w3c/manifest/pull/457.patch
https://github.com/w3c/manifest/pull/457.diff

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