[w3c/touch-events] Change a `should` to `MUST` (PR #128)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/touch-events/pull/128.html" title="Last updated on Jun 3, 2022, 2:52 PM UTC (f0baa8e)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/touch-events/128/82acb2b...f0baa8e.html" title="Last updated on Jun 3, 2022, 2:52 PM UTC (f0baa8e)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/touch-events/pull/128

-- Commit Summary --

  * Change a `should` to `MUST`

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/touch-events/pull/128.patch
https://github.com/w3c/touch-events/pull/128.diff

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