Reference the compatibility matrix (#17091)

Author: carmocca

docs/source-fabric/fundamentals/installation.rst

@@ -37,7 +37,8 @@ Fabric is part of the `Lightning <https://lightning.ai>`_ package. Here is how y
 
 
 If you don't already have it, this command will also install the latest `stable PyTorch version <https://pytorch.org/>`_.
-The oldest version of PyTorch that Fabric supports is v1.11.0.
+
+You can find our the list of supported PyTorch versions in our `compatibility matrix <https://lightning.ai/docs/pytorch/stable/versioning.html#compatibility-matrix>`__.
 
 
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docs/source-pytorch/index.rst

@@ -40,7 +40,7 @@ Pip users
 
 .. code-block:: bash
 
-    pip install 'lightning'
+    pip install lightning
 
 .. raw:: html
 
@@ -60,7 +60,7 @@ Conda users
 
 Or read the `advanced install guide <starter/installation.html>`_
 
-We are fully compatible with any stable PyTorch version v1.11 and above.
+You can find our the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
 
 .. raw:: html