Alexey Dolotov
b6ec95b9a7
contrib/sni-router: fix bogus 2.4 version reference
The doc said 'Requires mtg ≥ 2.4', but no such release exists — the
latest tag is v2.2.8 (2026-04-07) and #480 is in master since
2026-05-05 awaiting the next release. Replace the speculative version
with an honest pointer to #480 and a 'build from master' note that
stays correct regardless of when the next tag lands.
Refs #511.
Alexey Dolotov
b6ec95b9a7
contrib/sni-router: fix bogus 2.4 version reference