[docs] [issue25865] 7.2 Assignment statements documentation is vague and slightly misleading

[Andrew Barnert]

Andrew Barnert added the comment:

As a side note, why isn't () allowed as an empty target list, like []? Then the rules for target lists vs. single targets would be exactly parallel to the rules for tuple and list displays. And the error message `can't assign to ()` seems a bit weird--you can't really assign to the tuple `a, b, c` or `(a, b, c)`, but that's not what you're doing; you're just specifying a target list.

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