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docs: be more precise on what spack add ... does (#23204)

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This is as much a question as it is a minor fine-tuning of the docs.  I've been known to add things to an environment by editing the `spack.yaml` file directly.  When I read the previous version of this sentence, I was afraid that `spack add` was actually doing *two* things, modifying the `spack.yaml` and updating something else that defined the roots of the Environment.  A bit of experimentation suggests that editing the `spack.yaml` file is sufficient to change the roots.

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
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George Hartzell 2021-04-23 06:29:19 -07:00 committed by GitHub
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lib/spack/docs/environments.rst
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@ -248,9 +248,9 @@ Users can add abstract specs to an Environment using the ``spack add``
command. The most important component of an Environment is a list of
abstract specs.
Adding a spec adds to the manifest (the ``spack.yaml`` file) and to
the roots of the Environment, but does not affect the concrete specs
in the lockfile, nor does it install the spec.
Adding a spec adds to the manifest (the ``spack.yaml`` file), which is
used to define the roots of the Environment, but does not affect the
concrete specs in the lockfile, nor does it install the spec.
The ``spack add`` command is environment aware. It adds to the
currently active environment. All environment aware commands can also