docs: fix invalid -- inside an HTML comment body (argus nit on #4146)

Em dash to match house style everywhere else, plus HTML comment
bodies can't contain a literal --.
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iris 2026-09-09 20:50:54 +02:00 committed by mara
commit 397c0a9c7a

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@ -242,7 +242,7 @@ programmatically and don't pass `--message-format json` themselves.
<!-- vale Microsoft.Avoid = NO -->
<!-- "backend" here means "which LLM API provider" (a genuinely pluggable
choice, matching the nix option's own name `backendEnvironmentFile`) --
choice, matching the nix option's own name `backendEnvironmentFile`)
not one internal system to name instead, so mara's #4041 ruling doesn't
apply to this section. -->