Fix doc nits

[to be squashed]
[skip ci]
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4356)

doc/man3/EVP_PKEY_meth_new.pod

@@ -353,7 +353,7 @@ then the built-in objects.
 EVP_PKEY_meth_add0() adds B<pmeth> to the user defined stack of methods.
 
 EVP_PKEY_meth_remove() removes an B<EVP_PKEY_METHOD> object added by
-EVP_PKEY_meth_new().
+EVP_PKEY_meth_add0().
 
 The EVP_PKEY_meth_set functions set the corresponding fields of
 B<EVP_PKEY_METHOD> structure with the arguments passed.