[whatwg/encoding] Add some minor clarifications. (#244)

Closes #239 and #243.

cc @wlammen


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  https://github.com/whatwg/encoding/pull/244

-- Commit Summary --

  * Add some minor clarifications.

-- File Changes --

    M encoding.bs (32)

-- Patch Links --

https://github.com/whatwg/encoding/pull/244.patch
https://github.com/whatwg/encoding/pull/244.diff

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