✏️ Fix typo in docs for `docs/en/docs/advanced/middleware.md` (#5376)
✏️ Fix typo in docs for `docs/en/docs/advanced/middleware.md` (#5376)

Fix typo in documentation

A full-stop was missing in `TrustedHostMiddleware` section

Co-authored-by: Sebastián Ramírez <668e2a3febf6a4b75056e840735926407962bc4e@gmail.com>
tiangolo/fastapi,tiangolo/fastapi,tiangolo/fastapi