[w3c/clipboard-apis] read(formats) ambiguous (Issue #209)

WRT https://w3c.github.io/clipboard-apis/#dom-clipboard-read

1. `items` is referenced after it is no longer in scope ("if `items` has size > 0" comes after the scope of "Let `items` [...]"
2. "Set representation’s [data](https://w3c.github.io/clipboard-apis/#representation-data) to systemClipboardRepresentation’s [data](https://w3c.github.io/clipboard-apis/#system-clipboard-representation-data)." has a type mismatch, because the former `data` is a Promise and the latter `data` is a sequence of bytes
3. The steps in "Else" go 1, 2, 3, 1
4. In the text "If customItem’s [list of representations](https://w3c.github.io/clipboard-apis/#list-of-representations) size is greater than 0, append item to items.", `item` is undefined AFAICT

I also can't figure out why there are two different places where the algorithm says "Run the [read web custom format](https://w3c.github.io/clipboard-apis/#read-web-custom-format) algorithm", perhaps because the above issues (and others?) are making it difficult to understand the flow.

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