Re: [whatwg/streams] Editorial: add cross-links to internal slots (#1050)

Ran into an issue. [ReadableStreamClose](https://streams.spec.whatwg.org/commit-snapshots/d6ea924ae7e2f445b913aa1df394029bf73804b7/#readable-stream-close) has the following step:
> 6. Resolve _reader_.[[closedPromise]] with undefined.

However, `[[closedPromise]]` may refer to the internal slot of *either* `ReadableStreamDefaultReader` or `ReadableStreamBYOBReader`. So there's no single link I can put here. 😕

Do we need to introduce an "interface mixin" (like [`TextDecoderCommon` in the Encoding spec](https://encoding.spec.whatwg.org/#interface-mixin-textdecodercommon)) where we can define the internal slots shared between the two reader classes (i.e. `[[closedPromise]]` and `[[stream]]`)?

Or should we add a section "Interfacing with readers" just to define the common internal slots without any Web IDL, like we did with ["Interfacing with controllers"](https://streams.spec.whatwg.org/commit-snapshots/d6ea924ae7e2f445b913aa1df394029bf73804b7/#rs-abstract-ops-used-by-controllers)?

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