[issue25225] Idle doc: redo Syntax Colors section

[Terry J. Reedy]

Terry J. Reedy added the comment:

I decided to keep a further condensed subsection.  I think there is a bit of extra info, and we may need or want to say more after other changes, such as for #7949, and the addition of a dark theme. The reference manual documents our current promises.

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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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