[heycam/webidl] Editorial: improve language around conversions to JS (#664)

This prose is converting IDL values to JS values, so they should not try to
convert to IDL types.

Separately, fix some grammar nits.

Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=20455.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/664

-- Commit Summary --

  * Editorial: improve language around conversions to JS

-- File Changes --

    M index.bs (13)

-- Patch Links --

https://github.com/heycam/webidl/pull/664.patch
https://github.com/heycam/webidl/pull/664.diff

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