Fix typo in README.md (#4148)

Summary: Pull Request resolved: #4148

Reviewed By: SS-JIA

Differential Revision: D59343073

fbshipit-source-id: 19b0e1b73833f1beb7ad7cc0925540c985b0162d

Author: mergennachin

README.md

@@ -20,7 +20,7 @@ Key value propositions of ExecuTorch are:
 For a comprehensive technical overview of ExecuTorch and step-by-step tutorials,
 please visit our documentation website [for the latest release](https://pytorch.org/executorch/stable/index.html) (or the [main branch](https://pytorch.org/executorch/main/index.html)).
 
-Check out the [Getting Started](https://pytorch.org/executorch/stable/getting-started-setup.htmll#quick-setup-colab-jupyter-notebook-prototype) page for a quick spin.
+Check out the [Getting Started](https://pytorch.org/executorch/stable/getting-started-setup.html#quick-setup-colab-jupyter-notebook-prototype) page for a quick spin.
 
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