Editorial: Fix description of [[ErrorData]]

[ExE-Boss]

This proposal makes [[ErrorData]] store the list of Stack Frame records, but the description of [[ErrorData]] was not updated.

Depends on:

• [deps] update ecmarkup #35 (merged)

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Fixes #50

[ljharb]

I think that for this to land, we'd also have to account for the Error constructor text that populates this slot (see #1).

[ExE-Boss]

I think that for this to land, we'd also have to account for the Error constructor text that populates this slot (see #1).

I have a very WIP branch in normative/capture‑stack‑trace, but that depends on this, #37, and #52.

[ljharb]

It's probably best to hold off on this work until this proposal can be "rebased" on top of https://github.com/tc39/proposal-error-stack-accessor (when it hits stage 2.7 or 3, probably)