quic: use @-style Doxygen tags in ossl_quic_srtm_remove doc comment

quic: use @-style Doxygen tags in ossl_quic_srtm_remove doc comment

Convert the doc comment for ossl_quic_srtm_remove() from backslash-style
Doxygen tags (\brief, \param, \return) to the @-style equivalents
(@brief, @param, @returns), matching the STYLE.md convention.

Complements: 63afe639141f "quic: report SRTM entry match status via an output argument"
Signed-off-by: Nikola Pajkovsky <nikolap@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Jakub Zelenka <jakub.zelenka@openssl.foundation>
Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
MergeDate: Mon Aug  3 12:03:18 2026
(Merged from https://github.com/openssl/openssl/pull/32037)