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gh-133881: add forward reference tolist.sort() in lambda expression tutorial (#133910)

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Original file line number	Diff line number	Diff line change
`@@ -999,7 +999,8 @@ scope::`
`999`	`999`	`43`
`1000`	`1000`
`1001`	`1001`	`The above example uses a lambda expression to return a function. Another use`
`1002`		`-is to pass a small function as an argument::`
	`1002`	+is to pass a small function as an argument. For instance,:meth:`list.sort`
	`1003`	`+takes a sorting key function key which can be a lambda function::`
`1003`	`1004`
`1004`	`1005`	`>>> pairs = [(1, 'one'), (2, 'two'), (3, 'three'), (4, 'four')]`
`1005`	`1006`	`>>> pairs.sort(key=lambda pair: pair[1])`

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