gh-141984: Reword and reorganize the first part of Atoms docs #144117
+165
−50
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This freshens up Syntax Notes, Atoms introduction, Built-in constants, and Literals.
Identifiers and enclosed forms are left for a future PR.
References to mixed arithmetic are changed to link to the stdtypes documentation. In later passes I want to move the runtime semantics there; for now I want to make the “When a description of an arithmetic operator” note in the intro more correct.
📚 Documentation preview 📚: https://cpython-previews--144117.org.readthedocs.build/