The introduction to query_one is potentially misleading

[davep]

When query_one is introduced in the docs it says:

If you call it with a selector it will return the first matching widget.

This isn't how it works. IIRC it was true for a wee while, in the run up to the release of v0.2; but it hasn't been the case for at least 18 months.

This part should probably either be scrubbed, or it should mention the error that can be raised and perhaps stress that the selector must result in a single hit.

[willmcgugan]

Thanks. Fixed in main. a9e87b5

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