[openssl/openssl] 2752ab: Fix error in example.

[pauli]

  Branch: refs/heads/master
  Home:   https://github.openssl.org/openssl/openssl
  Commit: 2752ab2eb61dcfc799775d34eaeda3621b85f95f
      https://github.openssl.org/openssl/openssl/commit/2752ab2eb61dcfc799775d34eaeda3621b85f95f
  Author: Pauli <pauli at openssl.org>
  Date:   2022-07-22 (Fri, 22 Jul 2022)

  Changed paths:
    M doc/man3/EVP_PKEY_gettable_params.pod

  Log Message:
  -----------
  Fix error in example.

Fixes #18828

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Hugo Landau <hlandau at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18829)