CHANGES.md, NEWS.md: various ffixes

CHANGES.md, NEWS.md: various ffixes

 * Adding missing periods.
 * Consistently using "OpenSSL" as the project's name.
 * Fixing the "`EVP_SKEY`" formatting reverted by a merge resolution
   in f815ee19e066 "Harden RSA public encrypt".
 * Fitting the lines in 80 characters, do a bit more semantic line breaks.

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28734)