Update index.rst (#1478)

Co-authored-by: holly1238 <77758406+holly1238@users.noreply.github.com>

Author: brianjo

index.rst

@@ -497,7 +497,7 @@ Additional Resources
    :header: PyTorch Cheat Sheet
    :description: Quick overview to essential PyTorch elements.
    :button_link: beginner/ptcheat.html
-   :button_text: Download
+   :button_text: Open
 
 .. customcalloutitem::
    :header: Tutorials on GitHub
@@ -509,7 +509,7 @@ Additional Resources
    :header: Run Tutorials on Google Colab
    :description: Learn how to copy tutorial data into Google Drive so that you can run tutorials on Google Colab.
    :button_link: beginner/colab.html
-   :button_text: Download
+   :button_text: Open
 
 .. End of callout section