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pythongh-86482: Document assignment expression need for ()s (python#23291)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

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`@@ -1766,6 +1766,13 @@ Or, when processing a file stream in chunks:`
`1766`	`1766`	`while chunk:=file.read(9000):`
`1767`	`1767`	`process(chunk)`
`1768`	`1768`
	`1769`	`+Assignment expressions must be surrounded by parentheses when used`
	`1770`	`+as sub-expressions in slicing, conditional, lambda,`
	`1771`	`+keyword-argument, and comprehension-if expressions`
	`1772`	+and in ``assert`` and ``with`` statements.
	`1773`	`+In all other places where they can be used, parentheses are not required,`
	`1774`	+including in ``if`` and ``while`` statements.
	`1775`	`+`
`1769`	`1776`	`..versionadded::3.8`
`1770`	`1777`	See:pep:`572` for more details about assignment expressions.
`1771`	`1778`

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

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