Commit 97b6cc7

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book: typo fixes (#240)

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Original file line number	Diff line number	Diff line change
`@@ -339,7 +339,7 @@ void reference(std::string&& str) {`
`339`	`339`	`int main()`
`340`	`340`	`{`
`341`	`341`	`std::string lv1 = "string,"; // lv1 is a lvalue`
`342`		`- // std::string&& r1 = s1; // illegal, rvalue can't ref to lvalue`
	`342`	`+ // std::string&& r1 = lv1; // illegal, rvalue can't ref to lvalue`
`343`	`343`	`std::string&& rv1 = std::move(lv1); // legal, std::move can convert lvalue to rvalue`
`344`	`344`	`std::cout << rv1 << std::endl; // string,`
`345`	`345`

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