Fix the "our" word duplication in the docs (#19055)

There were a bit inconsistent sentences with
a word duplication issue in the documentation.

These changes also:
  * unify references to the Compatibility matrix
  * add a reference to the Compatibility matrix
    into PyTorch Lightning's Installation Docs

Author: Jamim

docs/source-fabric/fundamentals/installation.rst

@@ -38,7 +38,7 @@ 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/>`_.
 
-You can find our the list of supported PyTorch versions in our `compatibility matrix <https://lightning.ai/docs/pytorch/stable/versioning.html#compatibility-matrix>`__.
+You can find the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
 
 
 ----

docs/source-fabric/index.rst

@@ -62,7 +62,7 @@ Conda users
 
 Or read the :doc:`advanced install guide <fundamentals/installation>`.
 
-You can find our the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
+You can find the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
 
 .. raw:: html
 

docs/source-pytorch/index.rst

@@ -60,7 +60,7 @@ Conda users
 
 Or read the `advanced install guide <starter/installation.html>`_
 
-You can find our the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
+You can find the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
 
 .. raw:: html
 

docs/source-pytorch/starter/installation.rst

@@ -68,6 +68,8 @@ Custom PyTorch Version
 ^^^^^^^^^^^^^^^^^^^^^^
 To use any PyTorch version visit the `PyTorch Installation Page <https://pytorch.org/get-started/locally/#start-locally>`_.
 
+You can find the list of supported PyTorch versions in our :ref:`compatibility matrix <versioning:Compatibility matrix>`.
+
 ----