Spelling doc #3580

Duplicated tests descriptions

Backport of #3580 to 1.1.0
plus a few other typo fixes found at fligth.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/4645)