[w3c/manifest] Change platform android by play in exemple (#581)

To be consistent with https://github.com/w3c/manifest/wiki/Platforms
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/581

-- Commit Summary --

  * Change platform android by play in exemple

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/581.patch
https://github.com/w3c/manifest/pull/581.diff

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