[Sync EN] Clarify Argon2 memory_cost and time_cost units in password_hash() (#5219)

[github-actions]

Commit: https://github.com/php/doc-en/commit/6cc48aed6f887bdabf09c568f854099f9c74e017
PR: https://github.com/php/doc-en/pull/5219

Zu aktualisierende DE-Dateien

• reference/password/constants.xml
• reference/password/functions/password-hash.xml