Log Message:
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doc: clarify -cipher option syntax in man pages
Users reading the documentation for the -<cipher> option often
misunderstand the syntax. The notation "B<-I<cipher>>" renders as
"-cipher" with "cipher" in italics, leading users to think they
should type "-cipher aes-128-cbc" when the correct usage is
"-aes-128-cbc" (the cipher name directly as the option).
Update the documentation in openssl-genpkey, openssl-enc, and
openssl-pkey to explicitly state that the cipher name is prepended
with a hyphen and used directly as the option, not as an argument
to a "-cipher" flag.
Also add a reference to "openssl list -cipher-algorithms" to help
users discover available ciphers, and fix a typo in openssl-pkey
("and and" -> "and").