[Sync EN] Remove 72 unused entities from language-snippets.ent (#5625)

[github-actions]

Commit: https://github.com/php/doc-en/commit/9eb61e3573bc9af825caa0aba34932850aa1b666
PR: https://github.com/php/doc-en/pull/5625

Zu aktualisierende DE-Dateien

• language-snippets.ent