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

[jeremyroman]

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.

• At least two implementers are interested (and none opposed): n/a (no normative change)
• Tests are written and can be reviewed and commented upon at: n/a (no normative change)
• Implementation bugs are filed: n/a (no normative change)
• MDN issue is filed: n/a (no normative change)
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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