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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.