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Merge #9692

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9692: Use same cancelled spelling in doc and code. r=matklad a=mattiasgronlund

Right thing might be to update the spelling in the code to
follow American instead of English spelling, that is
using only canceled. But they should at least be aligned.

Co-authored-by: Mattias Grönlund <mattias@gronlund.se>
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@ -48,10 +48,10 @@ changes "uniquely", but we might also want to fork an `Analysis` and send it to
another thread for background processing. That is, there is only a single
`AnalysisHost`, but there may be several (equivalent) `Analysis`.
Note that all of the `Analysis` API return `Cancelable<T>`. This is required to
Note that all of the `Analysis` API return `Cancellable<T>`. This is required to
be responsive in an IDE setting. Sometimes a long-running query is being computed
and the user types something in the editor and asks for completion. In this
case, we cancel the long-running computation (so it returns `Err(Canceled)`),
case, we cancel the long-running computation (so it returns `Err(Cancelled)`),
apply the change and execute request for completion. We never use stale data to
answer requests. Under the cover, `AnalysisHost` "remembers" all outstanding
`Analysis` instances. The `AnalysisHost::apply_change` method cancels all