docs: Clarify Root Tasks. (#9098)

### Description

@nickfujita in #8972 pointed
out that the docs were confusing about how to use a Root Task, so making
sure to clarify that here.

### Testing Instructions

👀

docs/repo-docs/crafting-your-repository/configuring-tasks.mdx

@@ -280,14 +280,16 @@ You can also run scripts in the `package.json` in the Workspace root using `turb
 ```json title="./package.json"
 {
   "scripts": {
-    "lint": "turbo run lint",
+    "lint": "turbo run lint lint:root",
     "lint:root": "eslint ." // [!code highlight]
   }
 }
 ```
 </Tab>
 </Tabs>
 
+With the Root Task now registered, `turbo run lint:root` will now run the task. You can also run `turbo run lint lint:root` to run all your linting tasks.
+
 #### When to use Root Tasks
 
 - **Linting and formatting of the Workspace root**: You might have code in your Workspace root that you want to lint and format. For example, you might want to run ESLint or Prettier in your root directory.