[whatwg/encoding] Add more UTF-8, UTF-16BE, and UTF-16LE labels (#211)

Blink and WebKit have supported these for a long time.

Tests: https://github.com/web-platform-tests/wpt/pull/23427.

Fixes #168.

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<a href="https://whatpr.org/encoding/211.html" title="Last updated on May 6, 2020, 2:22 PM UTC (a39de01)">Preview</a> | <a href="https://whatpr.org/encoding/211/3911f81...a39de01.html" title="Last updated on May 6, 2020, 2:22 PM UTC (a39de01)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/211

-- Commit Summary --

  * Add more UTF-8, UTF-16BE, and UTF-16LE labels
  * oops

-- File Changes --

    M encoding.bs (24)
    M encodings.json (11)

-- Patch Links --

https://github.com/whatwg/encoding/pull/211.patch
https://github.com/whatwg/encoding/pull/211.diff

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