doc/man7/openssl-env: sort the capability envvars/links lexicographically

doc/man7/openssl-env: sort the capability envvars/links lexicographically

Put the mentions of OPENSSL_*cap environment variables and man page
references in lexicographical order.  Also, add an Oxford comma before
"and" in the man page references.

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/28025)