Two comment blocks explained things `docs/networking/gateway.md` already
explains, one of them directly above a line pointing at that very doc. A
pointer under a duplicate is not a pointer; it is a duplicate with a
citation.
Measured, not eyeballed: 6-gram intersection between this file's comments
and that doc, 73 -> 31. The residual is mostly the one-line summaries kept
at the call sites, which necessarily share phrasing with the doc they
summarise — that is the floor of the metric, not remaining duplication.
* the self-signed-cert import unit: kept the 🚨 that stops someone
collapsing it into "point nginx at the CA dir", both jobs at one line
each, and the blast radius (whole gateway, not one vhost). Dropped the
`BIO_new_file()` mechanism and the production-outage narrative — the
doc carries both, and the second is history.
* the nginx-reload note: rewritten to say the one thing this file needs
to say, that nothing here reloads nginx and hive-c0re drives it from
the host through hive-priv. The per-unit-state dispatch table is the
doc's, and only the doc has it in full.
Both pointers use the `docs/x.md::Section` form and name headings verified
to exist; the first replaces a parenthetical `("Self-signed TLS")` spelling
that no check can resolve.
Comments only; no behaviour change. Refs #3901.
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