[heycam/webidl] Reword the distinguishability algorithm. (#194)

This slightly clarifies the wording saying that nullable and dictionary
types aren't distinguishable, and adds an example to make it painfully
clear.

It also adds some examples for applying the distinguishability table.

Fixes #193
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/194

-- Commit Summary --

  * Reword the distinguishability algorithm.

-- File Changes --

    M index.bs (72)
    M index.html (477)

-- Patch Links --

https://github.com/heycam/webidl/pull/194.patch
https://github.com/heycam/webidl/pull/194.diff

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https://github.com/heycam/webidl/pull/194