Fix links in AI Toolkit documentation (#8652)

* fix links

* updated

Author: ms-johnalex

docs/intelligentapps/models.md

@@ -47,7 +47,7 @@ To add a model from the model catalog:
 
     - **GitHub**: AI Toolkit asks for your GitHub credentials to access the model repository. Once authenticated, the model is added directly into AI Toolkit.
         > [!NOTE]
-        > AI Toolkit now [supports GitHub pay-as-you-go models](playground.md#github-pay-as-you-go-model-support), so you can keep working after passing free tier limits.
+        > AI Toolkit now [supports GitHub pay-as-you-go models](/docs/intelligentapps/playground.md#_github-payasyougo-model-support), so you can keep working after passing free tier limits.
     - **ONNX**: The model is downloaded from ONNX and added to AI Toolkit.
     - **Ollama**: The model is downloaded from Ollama and added to AI Toolkit.
 

docs/intelligentapps/playground.md

@@ -31,7 +31,7 @@ AI Toolkit now supports GitHub pay-as-you-go models, so you can keep working aft
 
     ![Screenshot of the GitHub Pay-as-you-go Model support](./images/playground/github-pay-as-you-go.png)
 
-- Turn on billing for models in your [GitHub settings](https://github.com/settings/billing).
+- Turn on billing for models in your [GitHub settings](https://github.com/settings/billing) (requires signing in to your GitHub account).
 
 - After enabling billing, keep using the model in Playground or Agent Builder without changing your workflow.