Documentation Error: <||> should be <|?>

https://github.com/haskell/parsec/blob/905bc2e3e1c374934d49e16dc5b7c49bf2c3c815/src/Text/Parsec/Perm.hs#L105

In the documentation for the function `<|?>` the text refers to the operator `<||>` when it should be the `<|?>`

Open src/Text/Parsec/Perm.hs at line 105 and read the documentation for the <|?> operator. Confirm that the referenced operator name is inconsistent with the documented function, then correct the wording and verify that the documentation now names <|?> consistently.

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