[whatwg/streams] Remove preconditions from ReadableStreamDefaultControllerError (#925)

ReadableStreamDefaultControllerError had a note that specifications should
respect the preconditions (listed as asserts). However, it doesn't have any
asserts. Remove mention of preconditions.

No functional changes.

Fixes #920.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/925

-- Commit Summary --

  * Remove preconditions from ReadableStreamDefaultControllerError

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/whatwg/streams/pull/925.patch
https://github.com/whatwg/streams/pull/925.diff

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