Tim Duesterhus 27c70ae23c DOC: Improve documentation of the various hdr() fetches
GitHub issue #796 notes that many administrators miss the fact that the `hdr()`
fetch (without the `f`) splits the header value at commas. This is only
mentioned at the end of a long paragraph.

This patch attempts to improve the documentation by:
- Explaning the "comma issue" as early as possible.
- Adding newlines to split the explanation into distinct sections.
- Reducing duplication by making the `res` siblings refer to their `req`
  counterparts.

This patch may be backported as long as it applies cleanly. During the
refactoring I needed to adjust several explanations for consistency and not all
of them might be available in older branches.
2021-01-26 09:22:43 +01:00
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