Fix typo in JSDoc (#7594)

Author: luc122c

docs-devsite/app-check.md

@@ -155,7 +155,7 @@ export declare function onTokenChanged(appCheckInstance: AppCheck, onNext: (toke
 |  Parameter | Type | Description |
 |  --- | --- | --- |
 |  appCheckInstance | [AppCheck](./app-check.appcheck.md#appcheck_interface) | The App Check service instance. |
-|  onNext | (tokenResult: [AppCheckTokenResult](./app-check.appchecktokenresult.md#appchecktokenresult_interface)<!-- -->) =&gt; void | When the token changes, this function is called with aa [AppCheckTokenResult](./app-check.appchecktokenresult.md#appchecktokenresult_interface)<!-- -->. |
+|  onNext | (tokenResult: [AppCheckTokenResult](./app-check.appchecktokenresult.md#appchecktokenresult_interface)<!-- -->) =&gt; void | When the token changes, this function is called with an [AppCheckTokenResult](./app-check.appchecktokenresult.md#appchecktokenresult_interface)<!-- -->. |
 |  onError | (error: Error) =&gt; void | Optional. Called if there is an error thrown by the listener (the <code>onNext</code> function). |
 |  onCompletion | () =&gt; void | Currently unused, as the token stream is unending. |
 

packages/app-check/src/api.ts

@@ -259,7 +259,7 @@ export function onTokenChanged(
  * the current token associated with this App Check instance changes.
  *
  * @param appCheckInstance - The App Check service instance.
- * @param onNext - When the token changes, this function is called with aa
+ * @param onNext - When the token changes, this function is called with an
  * {@link AppCheckTokenResult}.
  * @param onError - Optional. Called if there is an error thrown by the
  * listener (the `onNext` function).