chore: Add packageDocumentation for API Docs Index

Signed-off-by: Adam Harvey <33203301+adamdmharvey@users.noreply.github.com>

plugins/permission-react/api-report.md

@@ -100,6 +100,4 @@ export function usePermission(
         resourceRef: string | undefined;
       },
 ): AsyncPermissionResult;
-
-// (No @packageDocumentation comment for this package)
 ```

plugins/permission-react/src/index.ts

@@ -14,6 +14,11 @@
  * limitations under the License.
  */
 
+/**
+ * Components and hooks to help implement permissions in Backstage frontend plugins.
+ *
+ * @packageDocumentation
+ */
 export * from './components';
 export * from './hooks';
 export * from './apis';