did more docs

types.ts

@@ -11,10 +11,16 @@ export interface RouterContext {
   request: Request;
 }
 
+/**
+ * @description a function that handles incoming requests
+ */
 export type Handler = (
   req: Request,
   ctx: RouterContext,
 ) => Promise<Response> | Response;
+/**
+ * @description a middleware function
+ */
 export type Middleware = (
   req: Request,
   ctx: RouterContext,