[w3c/push-api] Fix #361. Improving the readability (PR #363)

Closes #361

The current PR is to make the paragraph about revocation more readable.
It also changes the order of MUST and MAY to make the priorities are clear. 

No change of implementation, so no need to modify WPT.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/363

-- Commit Summary --

  * issue #361. Improving the readability

-- File Changes --

    M index.html (19)

-- Patch Links --

https://github.com/w3c/push-api/pull/363.patch
https://github.com/w3c/push-api/pull/363.diff

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