docs: Clarify how `order` and `on` in the param section

vega / altair

Declarative statistical visualization library for Python

https://altair-viz.github.io/

BSD 3-Clause "New" or "Revised" License

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Open joelostblom opened 1 month ago

joelostblom commented 1 month ago

Minor additions I noticed when reviewing https://github.com/vega/altair/pull/3544