✏️ 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 <tiangolo@gmail.com>

docs/en/docs/advanced/middleware.md

@@ -68,7 +68,7 @@ Enforces that all incoming requests have a correctly set `Host` header, in order
 
 The following arguments are supported:
 
-* `allowed_hosts` - A list of domain names that should be allowed as hostnames. Wildcard domains such as `*.example.com` are supported for matching subdomains to allow any hostname either use `allowed_hosts=["*"]` or omit the middleware.
+* `allowed_hosts` - A list of domain names that should be allowed as hostnames. Wildcard domains such as `*.example.com` are supported for matching subdomains. To allow any hostname either use `allowed_hosts=["*"]` or omit the middleware.
 
 If an incoming request does not validate correctly then a `400` response will be sent.