Modify title to say "removing" instead of "uninstalling"

Author: alecbcs

tutorial_environments.rst

@@ -233,11 +233,11 @@ We can now run ``tclsh`` just like you would any other program that is in your p
     hello world!
     % exit
 
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Uninstalling Packages from Environments
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Removing Packages from Environments
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-One of Spack's key features is that you can safely uninstall packages from specific environments without affecting other environments.
+One of Spack's key features is that you can safely remove packages from specific environments without affecting other environments.
 This works because Spack environments only create links to shared package installations—they don't contain the actual package files.
 
 Let's demonstrate this capability by creating a second environment.