Add mention of RFC 2128 (use_nested_groups) in the reference #230
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The feature
use_nested_groups
will soon be stabilized, and this PR adds a mention of it in the reference.This only adapts the current reference to be coherent with the new implementation, but it doesn't add a dedicated section about it. If that's something we want I can work on it (but I don't think it's really needed).
This fixes #225, tracking issue rust-lang/rust#44494