Add docs for replace utility

Author: brophdawg11

docs/fetch/replace.md

@@ -0,0 +1,32 @@
+---
+title: replace
+new: true
+---
+
+# `replace`
+
+This is a small wrapper around [`redirect`][redirect] that will trigger a client-side redirect to the new location using `history.replaceState` instead of `history.pushState`.
+
+## Type Declaration
+
+```ts
+type RedirectFunction = (
+  url: string,
+  init?: number | ResponseInit
+) => Response;
+```
+
+## `url`
+
+The URL to redirect to.
+
+```js
+replace("/otherapp/login");
+```
+
+## `init`
+
+The `status` or the [Response][response] options to be used in the response.
+
+[response]: https://developer.mozilla.org/en-US/docs/Web/API/Response/Response
+[redirect]: ./redirect