[whatwg/streams] Use sentence case, not title case, for headings (#886)

WHATWG standards use sentence case for headings. Streams currently uses title case. So, currently Streams says:

> Transform Stream Default Controller Abstract Operations

This should instead be

> Transform stream default controller abstract operations

This does not affect too many headings, since a lot of headings are abstract operations or API surfaces, which are not affected by this.

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