update manual to reflect &'lifetime syntax
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@ -3162,7 +3162,7 @@ Borrowed pointers (`&`)
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Borrowed pointers arise by (automatic) conversion from owning pointers, managed pointers,
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or by applying the borrowing operator `&` to some other value,
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including [lvalues, rvalues or temporaries](#lvalues-rvalues-and-temporaries).
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Borrowed pointers are written `&content`, or in some cases `&f/content` for some lifetime-variable `f`,
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Borrowed pointers are written `&content`, or in some cases `&'f content` for some lifetime-variable `f`,
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for example `&int` means a borrowed pointer to an integer.
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Copying a borrowed pointer is a "shallow" operation:
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it involves only copying the pointer itself.
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