docs: complete JSDocs for utils/http.ts (denoland#533)

Supercedes denoland#497
Towards denoland#492

utils/http.ts

@@ -1,14 +1,25 @@
 // Copyright 2023 the Deno authors. All rights reserved. MIT license.
-import type { RedirectStatus, Status } from "std/http/http_status.ts";
+import { RedirectStatus, Status } from "std/http/http_status.ts";
 
 /**
+ * Returns a response that redirects the client to the given location (URL).
+ *
  * @param location A relative (to the request URL) or absolute URL.
  * @param status HTTP status
+ *
  * @see {@link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Location}
+ *
+ * @example
+ * ```ts
+ * import { redirect } from "@/utils/http.ts";
+ *
+ * redirect("/new-page"); // Redirects client to `/new-page` with HTTP status 303
+ * redirect("/new-page", 301); // Redirects client to `/new-page` with HTTP status 301
+ * ```
  */
 export function redirect(
   location: string,
-  status: Status.Created | RedirectStatus = 303,
+  status: Status.Created | RedirectStatus = Status.SeeOther,
 ) {
   return new Response(null, {
     headers: {
@@ -18,6 +29,17 @@ export function redirect(
   });
 }
 
+/**
+ * Returns the `cursor` URL parameter value of the given URL.
+ *
+ * @example
+ * ```ts
+ * import { getCursor } from "@/utils/http.ts";
+ *
+ * getCursor(new URL("http://example.com?cursor=12345")); // Returns "12345"
+ * getCursor(new URL("http://example.com")); // Returns ""
+ * ```
+ */
 export function getCursor(url: URL) {
   return url.searchParams.get("cursor") ?? "";
 }