[PATCH] Fix typos in XOR docstring and WITH-{INPUT-FROM, OUTPUT-TO}-FILE error messages

[Attila Lendvai]

pushed, thanks!

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• attila lendvai
• PGP: 963F 5D5F 45C7 DFCD 0A39
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work your best works, looking to your own conscience for approval.”
	— Susan B. Anthony (1820–1906)