rm extra newline

Author: cmelone

tutorial_environments.rst

@@ -157,7 +157,6 @@ Let's try it:
 
 Now, ``tcl`` and ``trilinos`` have been registered as **root specs** in our environment. **Root specs** are packages that we've explicitly requested to be installed in an environment.
 
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 They're called **"roots"** because they sit at the top of the dependency graph---when Spack installs these packages, with their respective dependency packages sitting below them.
 
 Now, let's install:
@@ -276,7 +275,6 @@ In this section, we'll learn how to enforce that all the packages in our environ
 
 We can customize the selection of the ``mpi`` provider using `concretization preferences <https://spack.readthedocs.io/en/latest/build_settings.html#concretization-preferences>`_ to change the behavior of the concretizer.
 
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 Let's start by examining our environment's configuration using ``spack config get``:
 
 .. literalinclude:: outputs/environments/config-get-1.out