A little finetuning of the documentation part

Author: anakinj

ext/openssl/ossl_pkey.c

@@ -599,7 +599,7 @@ pkey_from_parameters(int argc, VALUE *argv, VALUE self)
  *
  * Generates new parameters for the algorithm. _algo_name_ is a String that
  * represents the algorithm. The optional argument _options_ is a Hash that
- * specifies the options specific to the algorithm. The orderq of the options
+ * specifies the options specific to the algorithm. The order of the options
  * can be important.
  *
  * A block can be passed optionally. The meaning of the arguments passed to
@@ -650,6 +650,7 @@ ossl_pkey_s_generate_key(int argc, VALUE *argv, VALUE self)
  *    OpenSSL::PKey.from_parameters(algo_name, parameters) -> pkey
  *
  * Generates a new key based on given key parameters.
+ * NOTE: Will only work on OpenSSL 3.0 or later.
  *
  * The first parameter is the type of the key to create, given as a String, for example RSA, DSA, EC etc.
  * Second parameter is the parameters to be used for the key.