docs: remove limitation of losing readonly modifier

source/function-overloads.d.ts

@@ -14,7 +14,6 @@ Use-cases:
 Known limitions:
 - Functions that have identical parameters but different `this` types or return types will only extract one overload (the last one)
 - Generic type parameters are lost and inferred as `unknown`
-- `readonly` modifier on readonly rest parameter will be lost if other parameters are present because it cannot be represented with tuples
 
 @example
 ```ts