doc/man3/EVP_EncryptInit.pod: add EVP_CIPHER_CTX_rand_key

Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4843)