[openssl/openssl] ae9eaf: Fix typo in migration guide

[Tobias Nießen]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: ae9eaf15506dc04c92bebf9b08d14956784dfbe4
      https://github.com/openssl/openssl/commit/ae9eaf15506dc04c92bebf9b08d14956784dfbe4
  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)

(cherry picked from commit 4c10099086dd75d583317056fb5ce0f88825bf0c)