Change helpText for "model" radio button group

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In #67 (comment), @terracoda said:

Atomic Model radiogroup on screen 1
@DianaTavares, upon a closer look, I see "Classical" and "Quantum" flow for the models. Would it make sense to capture that representation in the help text?

• I propose changing: Choose atomic model to explore.
• To something like these:
  • Choose from a range of classical and quantum models to explore.
  • Explore a range of classical and quantum models.

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This is related to the helpText of the radio button group used to choose the model. The helpText is currently “Choose atomic model to explore.” While there is a Classical/Quantum continuum in the Specta screen, there is no continuum in the Energy Levels screen — all of the models are quantum. My understanding is that the current language was chosen to work for both screens. So if you go down this path, we’ll need to customize the helpText per screen -- more development time, more strings to translate. My recommendation is to leave it as is.

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11/7/24 design meeting: @DianaTavares @arouinfar @kathy-phet @terracoda @LindaStegemann @ariel-phet @KatieWoe @pixelzoom

@arouinfar We make the classical/quantum distinction in the screen summary, so favor a generic description here. Consensus was no change.