Inconsistency with RFCs

[cgueret]

* (because fragments are a facet of user-agent behaviour, they
* don't make any sense in Location or Content-Location headers)

seems to contradict https://tools.ietf.org/html/rfc7231#section-7.1.2
Would be good to adjust either the doc or the RFC to reach some consistency.

[cgueret]

Actually relates to https://github.com/bbcarchdev/anansi/blob/d9f164ec1ff688ff15e89371dbf2efc1c130c05b/libcrawl/fetch.c#L460-L463