[Sync EN] ext/soap: document PHP 8.4 changes (#5735)

Commit: `https://github.com/php/doc-en/commit/d20d66d9c76ff98dceb853aeb86794fe9d657669`
PR: `https://github.com/php/doc-en/pull/5735`

**Archivos ES a actualizar**
- `reference/soap/soapclient.xml`
- `reference/soap/soapclient/construct.xml`
- `reference/soap/soapserver/construct.xml`
- `reference/soap/soapserver/setpersistence.xml`
- `reference/soap/soapvar/construct.xml`

