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gh-86482: Document assignment expression need for ()s (GH-23291)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>(cherry picked from commit2b5f136)Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

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`@@ -1748,6 +1748,13 @@ Or, when processing a file stream in chunks:`
`1748`	`1748`	`while chunk:=file.read(9000):`
`1749`	`1749`	`process(chunk)`
`1750`	`1750`
	`1751`	`+Assignment expressions must be surrounded by parentheses when used`
	`1752`	`+as sub-expressions in slicing, conditional, lambda,`
	`1753`	`+keyword-argument, and comprehension-if expressions`
	`1754`	+and in ``assert`` and ``with`` statements.
	`1755`	`+In all other places where they can be used, parentheses are not required,`
	`1756`	+including in ``if`` and ``while`` statements.
	`1757`	`+`
`1751`	`1758`	`..versionadded::3.8`
`1752`	`1759`	See:pep:`572` for more details about assignment expressions.
`1753`	`1760`

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`@@ -0,0 +1 @@`
	`1`	`+Document some places where an assignment expression needs parentheses.`

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