[Sync EN] request_parse_body: Clarify behavior when body already consumed (#5504)

[github-actions]

Commit: https://github.com/php/doc-en/commit/c78af136d0497e16230218083ce43448f1864272
PR: https://github.com/php/doc-en/pull/5504

Fichiers FR à mettre à jour

• reference/network/functions/request-parse-body.xml