Docs: Add caution about ranges like py{39-314}
#3652
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A very minor documentation addition.
Tox's ultra-concise environment naming creates some challenges when using features like range expansions. If the user tries to define a range like
py{39-314}, they'll get a lot more than they bargained for. Add a "Caution" box to the documentation about the range feature, reminding users to consider what their ranges mean numerically, rather than semantically.tox -e fix)docs/changelogfolder