fix a typo and mention OpenBSD in HISTORY;
both pointed out by jsing@

Import the SSL_CTX_set1_groups(3) manual page from OpenSSL, deleting
the read accessors we don't have and fixing the prototypes - the
data type of each and every argument differs in the OpenSSL manua

Import the SSL_CTX_set1_groups(3) manual page from OpenSSL, deleting
the read accessors we don't have and fixing the prototypes - the
data type of each and every argument differs in the OpenSSL manuals.
Reference the new page from SSL_set_tmp_ecdh(3) as suggested by jsing@.

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