fix: port and fragment

src/Std/Internal/Http/Data/URI/Basic.lean

@@ -892,14 +892,6 @@ def authority? : RequestTarget → Option URI.Authority
   | .absoluteForm u _ => u.authority
   | _ => none
 
-/--
-Extracts the fragment component from a request target, if available.
--/
-def fragment? : RequestTarget → Option String
-  | .originForm _ _ => none
-  | .absoluteForm u _ => u.fragment
-  | _ => none
-
 /--
 Extracts the full URI if the request target is in absolute form.
 -/