[Sync EN] Fix typos and grammars in the features directory (#5896)

Commit: `https://github.com/php/doc-en/commit/5e6ca803fc284739a7b1e7fba58b6b8466d5006f`
PR: `https://github.com/php/doc-en/pull/5896`

**Fichiers FR à mettre à jour**
- `features/commandline.xml`
- `features/connection-handling.xml`
- `features/cookies.xml`
- `features/dtrace.xml`
- `features/file-upload.xml`
- `features/gc.xml`
- `features/http-auth.xml`
