docs(api): enhance abortNavigation util

docs/content/3.api/3.utils/abort-navigation.md

@@ -1,16 +1,68 @@
 # `abortNavigation`
 
+`abortNavigation` is a helper function that prevents navigation from taking place and throws an error if one is set as a parameter.
+
+::alert{type="warning"}
+`abortNavigation` is only usable inside a [route middleware handler](/guide/directory-structure/middleware).
+::
+
+## Type
+
 ```ts
 abortNavigation(err?: Error | string): false
 ```
 
-* **err**: Optional error to be thrown by `abortNavigation()`.
+## Parameters
 
-::alert{type="warning"}
-`abortNavigation()` is only usable inside a [route middleware handler](/guide/directory-structure/middleware).
-::
+### `err`
+
+- **Type**: [`Error`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Global_Objects/Error) | `string`
+
+  Optional error to be thrown by `abortNavigation`.
+
+## Examples
+
+The example below shows how you can use `abortNavigation` in a route middleware to prevent unauthorized route access:
 
-Inside a route middleware handler, `abortNavigation()` will abort navigation, and throw an error if one is set as a parameter.
+```ts [middleware/auth.ts]
+export default defineNuxtRouteMiddleware((to, from) => {
+  const user = useState('user')
+
+  if (!user.value.isAuthorized) {
+    return abortNavigation()
+  }
+
+  return navigateTo('/edit-post')
+})
+```
+
+### `err` as a String
+
+You can pass the error as a string:
+
+```ts [middleware/auth.ts]
+export default defineNuxtRouteMiddleware((to, from) => {
+  const auth = useState('auth')
+
+  if (!user.value.isAuthorized) {
+    abortNavigation('Insufficient permissions.')
+  }
+})
+```
+
+### `err` as an Error Object
+
+You can pass the error as an [`Error`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Global_Objects/Error) object, e.g. caught by the `catch`-block:
+
+```ts [middleware/auth.ts]
+export default defineNuxtRouteMiddleware((to, from) => {
+  try {
+    /* code that might throw an error */
+  } catch (err) {
+    abortNavigation(err)
+  }
+})
+```
 
 ::ReadMore{link="/guide/features/routing"}
 ::