[whatwg/dom] Editorial: Update use of WebIDL "invoke a callback function" (PR #1301)

The single use, in mutation observers, no longer needs to deal with reporting the exception itself, but simply request that WebIDL do so.

Part of whatwg/webidl#1425.

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1301

-- Commit Summary --

  * Editorial: Update use of WebIDL "invoke a callback function"

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/1301.patch
https://github.com/whatwg/dom/pull/1301.diff

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