[whatwg/webidl] Editorial: fix typos in "react" and "wait for all" (PR #1660)

This fixes three editorial issues in the promise helper algorithms.

### Trailing colons.

Four steps that create a function with CreateBuiltinFunction end with a colon.

[react](https://webidl.spec.whatwg.org/#dfn-perform-steps-once-promise-is-settled):
  1. Let |onFulfilled| be CreateBuiltinFunction(|onFulfilledSteps|, 1, "", « »):
  1. Let |onRejected| be CreateBuiltinFunction(|onRejectedSteps|, 1, "", « »):

[wait for all](https://webidl.spec.whatwg.org/#wait-for-all):
  1. Let |rejectionHandler| be CreateBuiltinFunction(|rejectionHandlerSteps|, 1, "", « »):
  1. Let |fulfillmentHandler| be CreateBuiltinFunction(|fulfillmentHandler|, 1, "", « »):

They now end with a period, like the other CreateBuiltinFunction steps in the spec.

### Reused variable name in "wait for all".

|fulfillmentHandler| is declared twice: first for the steps, then for the function created from them.

1. Let |fulfillmentHandler| be the following steps given |arg|:
1. Let |fulfillmentHandler| be CreateBuiltinFunction(|fulfillmentHandler|, 1, "", « »):

The steps are renamed to |fulfillmentHandlerSteps|, matching |rejectionHandlerSteps| in the same algorithm.

### Misspelling in "wait for all".

|fullfilledCount| is renamed to |fulfilledCount|.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1660

-- Commit Summary --

  * Editorial: fix typos in "react" and "wait for all"

-- File Changes --

    M index.bs (16)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1660.patch
https://github.com/whatwg/webidl/pull/1660.diff

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