[heycam/webidl] Fix typos in advisements relating to using `true` as default values (#380)

Small changes to the documentation to fix some typos and grammar errors in some advisements.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/380

-- Commit Summary --

  * Fix typos in advisements relating to using `true` as default values

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/heycam/webidl/pull/380.patch
https://github.com/heycam/webidl/pull/380.diff

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https://github.com/heycam/webidl/pull/380