Further harmonisation of manual page HISTORY sections

A couple of minor tweaks to match the style introduced in #7854:
- BIO_connect: remove line break to make more grep friendly
- SSL_CTX_new: harmoise the format of the HISTORY section

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>

(cherry picked from commit 938e82f622eb04ebbfe534c79d234d0f6a0df035)

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8736)