[whatwg/encoding] Add a non-normative note about how the set of encodings was selected (#209)

Add a note documenting some things mention in #207.


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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/209

-- Commit Summary --

  * Add a non-normative note about how the set of encodings was selected

-- File Changes --

    M encoding.bs (11)

-- Patch Links --

https://github.com/whatwg/encoding/pull/209.patch
https://github.com/whatwg/encoding/pull/209.diff

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