add basic references to the new methods in documentation

Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1334)

doc/man3/X509_dup.pod

@@ -170,6 +170,8 @@ RSA_OAEP_PARAMS_free,
 RSA_OAEP_PARAMS_new,
 RSA_PSS_PARAMS_free,
 RSA_PSS_PARAMS_new,
+SCRYPT_PARAMS_free,
+SCRYPT_PARAMS_new,
 SXNETID_free,
 SXNETID_new,
 SXNET_free,

doc/man3/d2i_X509.pod

@@ -133,6 +133,7 @@ d2i_RSA_PSS_PARAMS,
 d2i_RSA_PUBKEY,
 d2i_RSA_PUBKEY_bio,
 d2i_RSA_PUBKEY_fp,
+d2i_SCRYPT_PARAMS,
 d2i_SCT_LIST,
 d2i_SXNET,
 d2i_SXNETID,
@@ -307,6 +308,7 @@ i2d_RSA_PSS_PARAMS,
 i2d_RSA_PUBKEY,
 i2d_RSA_PUBKEY_bio,
 i2d_RSA_PUBKEY_fp,
+i2d_SCRYPT_PARAMS,
 i2d_SCT_LIST,
 i2d_SXNET,
 i2d_SXNETID,