PR #192 (79d755cd) moved rustls, quinn, rcgen and tokio-rustls to aws-lc-rs,
but two comments in identity.rs still credited ring:
* the module doc credited the P-256 key to "ring via rcgen" — rcgen now
selects `aws_lc_rs` (punktfunk-host/Cargo.toml:135, punktfunk-core/Cargo.toml:80);
* the legacy-RSA fallback claimed "rustls/ring can SERVE an existing RSA cert".
The substance still holds under aws-lc-rs; only the provider name was wrong.
4903c9d3 fixed the `generate()` doc but missed the module doc, whose phrase wraps
across two lines ("generated by" / "ring via rcgen"), so a line-based grep never
matched it.
Comment-only: every changed line is a comment, cargo fmt clean.
enricobuehler