[w3c/selection-api] Remove the stray sentence that editing hosts outside a document cannot have a selection (PR #156)

Preceeding paragraphs make it clear that selection is a concept of a document and nothing else.

Closes issue #1


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<a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/pull/156.html" title="Last updated on Jul 13, 2022, 3:38 AM UTC (0a6a47b)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/156/5fea97d...0a6a47b.html" title="Last updated on Jul 13, 2022, 3:38 AM UTC (0a6a47b)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/156

-- Commit Summary --

  * Remove the stray sentence that editing hosts outside a document cannot have a selection

-- File Changes --

    M index.html (3)

-- Patch Links --

https://github.com/w3c/selection-api/pull/156.patch
https://github.com/w3c/selection-api/pull/156.diff

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