[Sync EN] replace para with simpara in extensions (#5523)

Commit: `https://github.com/php/doc-en/commit/067e27db0a6f790ee0faaf99aa1f321f88f82cc9`
PR: `https://github.com/php/doc-en/pull/5523`

**Fichiers FR à mettre à jour**
- `extensions.ent`

