Document how to set `max-height` of dropdowns dynamically

[cpcallen]

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Problem

core/css.ts sets the maximum height of dropdowns to 300px. This helps keep dropdowns from overflowing the workspace, but can also force the user to scroll field pop-ups unnecessarily, e.g. when editing large bitmaps.

Request

The maximum dropdown size can be overridden with CSS. Document how to do this.

Alternatives considered

No response

Additional context

See also #4695.

[maribethb]

Note that you can override the max-height of the dropdown div with css.

[BeksOmega]

Should this be changed to a docs issue given that?

[Spoorthy1423]

@cpcallen i would like to work on this issue, can u please assign me this issue