[Sync EN] Move emphasis to the beginning of the sentence and make it consistent with other items (#5538)

[github-actions]

Commit: https://github.com/php/doc-en/commit/86a4b30f22f16793d60adbce234d3786b9f3500e
PR: https://github.com/php/doc-en/pull/5538

Fichiers FR à mettre à jour

• reference/errorfunc/functions/debug-backtrace.xml