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docs: update chain.rst to improve discussion of upstreams (#43918)

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* Update chain.rst

* Update lib/spack/docs/chain.rst

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

* Update lib/spack/docs/chain.rst

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

* docs: rm leading spaces to avoid indent

---------

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>
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lib/spack/docs/chain.rst
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@ -11,7 +11,8 @@ Chaining Spack Installations
You can point your Spack installation to another installation to use any
packages that are installed there. To register the other Spack instance,
you can add it as an entry to ``upstreams.yaml``:
you can add it as an entry to ``upstreams.yaml`` at any of the
:ref:`configuration-scopes`:
.. code-block:: yaml
@ -22,7 +23,8 @@ you can add it as an entry to ``upstreams.yaml``:
install_tree: /path/to/another/spack/opt/spack
``install_tree`` must point to the ``opt/spack`` directory inside of the
Spack base directory.
Spack base directory, or the location of the ``install_tree`` defined
in :ref:`config.yaml <config-yaml>`.
Once the upstream Spack instance has been added, ``spack find`` will
automatically check the upstream instance when querying installed packages,