docs: Adding more helpful comments

src/example-1-simple.ts

@@ -9,6 +9,9 @@ import process from "process";
   // via generics. you can pass in any serializable arguments you
   // want, and accept any serializable return value you want.
   //
+  // try changing the type of the argument to "hello" to a number,
+  // to see the type-safety in action.
+  //
   // this function will be served by the helloService
   const greeting = await d.call<typeof helloService, "hello">(
     "hello",

src/example-2-complex.ts

@@ -1,6 +1,11 @@
 import { d } from "./d";
 import type { crawlerService } from "./services/crawler-service";
 
+// this is a more complex example, where we call a service that
+// returns a complex object.
+//
+// the crawlerService.getImages is a function crawling a website
+// and returning a list of images that it found on the page.
 (async function () {
   const images = await d.call<typeof crawlerService, "getImages">(
     "getImages",