Update environment documentation.

Author: Bruce J Palmer

docs/user_manual/tex/environment.tex

@@ -3,7 +3,8 @@ \section{Environment}\label{environment}
 GridPACK applications need to initialize several libraries in order to execute
 properly. These can be initialized explicitly by the user in their
 application but they can also be initialized by creating a single
-\texttt{\textbf{Environment}} object at the start of the code. The constructor
+\texttt{\textbf{Environment}} object at the start of the code. This module uses
+just the \texttt{\textbf{gridpack}} namespace. The constructor
 for this object will automatically call all the appropriate initialization
 functions for libraries used by GridPACK. This object can also be used to
 support an inline help message that can be used to document how to use the