Remove Microsoft Learn reference from intro tutorial (#3685)

Microsoft Learn integration is not implemented in the tutorials. Only
Google Colab links are available at the top of tutorial pages. This
updates the documentation to reflect the actual functionality.

Fixes #3678

## Description
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## Checklist
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- [ ] The issue that is being fixed is referred in the description (see
above "Fixes #ISSUE_NUMBER")
- [ ] Only one issue is addressed in this pull request
- [ ] Labels from the issue that this PR is fixing are added to this
pull request
- [ ] No unnecessary issues are included into this pull request.

Author: patrocinio

beginner_source/basics/intro.py

@@ -34,7 +34,7 @@
 -------------------------
 You can run this tutorial in a couple of ways:
 
-- **In the cloud**: This is the easiest way to get started! Each section has a "Run in Microsoft Learn" and "Run in Google Colab" link at the top, which opens an integrated notebook in Microsoft Learn or Google Colab, respectively, with the code in a fully-hosted environment.
+- **In the cloud**: This is the easiest way to get started! Each section has a "Run in Google Colab" link at the top, which opens an integrated notebook in Google Colab with the code in a fully-hosted environment.
 - **Locally**: This option requires you to setup PyTorch and TorchVision first on your local machine (`installation instructions <https://pytorch.org/get-started/locally/>`_). Download the notebook or copy the code into your favorite IDE.