[heycam/webidl] Promise wait-for-all link text confusing (#787)

https://heycam.github.io/webidl/#ref-for-wait-for-all

```html
<dfn id="waiting-for-all-promise" export lt="get a promise to wait for all|getting a promise to wait for all">get a promise for waiting for all</dfn>
```

Feels like the definition text content should be one of the possible link texts.

This caused confusion in https://github.com/w3c/ServiceWorker/pull/1463.

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