[openssl/openssl] 4c1009: Fix typo in migration guide

[Tobias Nießen]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 4c10099086dd75d583317056fb5ce0f88825bf0c
      https://github.com/openssl/openssl/commit/4c10099086dd75d583317056fb5ce0f88825bf0c
  Author: Tobias Nießen <tniessen at tnie.de>
  Date:   2022-08-23 (Tue, 23 Aug 2022)

  Changed paths:
    M doc/man7/migration_guide.pod

  Log Message:
  -----------
  Fix typo in migration guide

Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19032)