[Sync EN] PHP 8.5 changelog entries for readline functions (#5594)

Commit: `https://github.com/php/doc-en/commit/be246a268d0d5ab0b215c429cb031e70c98327ef`
PR: `https://github.com/php/doc-en/pull/5594`

**Zu aktualisierende DE-Dateien**
- `language-snippets.ent`
- `reference/readline/functions/readline-add-history.xml`
- `reference/readline/functions/readline-callback-handler-install.xml`
- `reference/readline/functions/readline-clear-history.xml`
