[docs] Use stable branch for "getting started" colab notebook.
The "Open in colab" link for the Getting Started guide should link to
the latest stable version, not development, since the notebook pip
installs the most recent release of CompilerGym but the development
branch may have breaking API changes.
@@ -2,7 +2,7 @@ Getting Started
===============
.. image:: https://colab.research.google.com/assets/colab-badge.svg
- :target: https://colab.research.google.com/github/facebookresearch/CompilerGym/blob/development/examples/getting-started.ipynb
+ :target: https://colab.research.google.com/github/facebookresearch/CompilerGym/blob/stable/examples/getting-started.ipynb
CompilerGym is a toolkit for applying reinforcement learning to compiler
optimization tasks. This document provides a short walkthrough of the key
