Fix L<> entries without sections

Fix L<> entries without sections

Add sections (almost always "(3)" to L<> references that were missing
them. Among other things, this
Fixes: #10226
Also remove two references to non-existant manpages that have never
existed, and with the 3.0 structure, are unlikely to do so.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10240)