Hi curl hackers,

it was mentioned some time ago (I could not find the relevant thread)
that the manpage of CURLOPT_HEADERFUNCTION advises to return -1. But
the return type is unsigned which is obviously wrong.

The attached patch makes both CURLOPT_HEADERFUNCTION and
CURLOPT_WRITEFUNCTION more consistent and tweaks a little bit the
wordings.

Comments are welcome.

Thanks and regards,
Julien

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