[Sync EN] ext/yac: Add a Memory Management chapter and improve the examples

[github-actions]

PR: https://github.com/php/doc-en/pull/5822 (2026-09-02)

Файлы RU для обновления

• reference/yac/book.xml
• reference/yac/configure.xml
• reference/yac/constants.xml
• reference/yac/ini.xml
• reference/yac/yac/add.xml
• reference/yac/yac/delete.xml
• reference/yac/yac/dump.xml
• reference/yac/yac/get.xml
• reference/yac/yac/info.xml
• reference/yac/yac/set.xml

Новые файлы EN (ещё не переведены)

• reference/yac/memory.xml