Fix documentation where openssl-genrsa is listed as deprecated since OpenSSL 3.0

Fix documentation where openssl-genrsa is listed as deprecated since OpenSSL 3.0

openssl-genrsa is not deprecated however the OpenSSL documentation
states that it is the case from OpenSSL 3.0. This has been fixed in the
documentation, specifically in manpage 1.

Fixes #21055

CLA: trivial

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21059)

(cherry picked from commit 4ad2dd43d0959b850c06c5a681d34aeb78d7c4b9)