fix syntax error

Author: albertobottopoala

pyro/pyro.tex

@@ -89,8 +89,8 @@ \section{\pyro 's structure}
 \url{http://python-hydro.github.io/pyro2/}, and described
 in \cite{pyro}.  Here we provide a summary.
 
-The grid structure is managed by the {\tt patch.Grid2d} class.  Data
-is that lives on the grid is contained in a {\tt
+The grid structure is managed by the {\tt patch.Grid2d} class. The data
+that lives on the grid is contained in a {\tt
   patch.CellCenterData2d} object.  Methods are available to provide
 access to the data and fill the ghost cells.  When accessing the data
 on the grid, a {\tt array\_indexer.ArrayIndexer} object is returned.