couple more shf documentation files

Author: emorway-usgs

doc/mf6io/gwe/shf.tex

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+Input to the Sensible Heat Flux (SHF) Package is read from the file that is specified in the SHF6 record of the OPTIONS block in the SFE package.
+
+\vspace{5mm}
+\subsubsection{Structure of Blocks}
+\vspace{5mm}
+
+\noindent \textit{FOR EACH SIMULATION}
+\lstinputlisting[style=blockdefinition]{./mf6ivar/tex/utl-shf-options.dat}
+\vspace{5mm}
+\noindent \textit{FOR ANY STRESS PERIOD}
+\lstinputlisting[style=blockdefinition]{./mf6ivar/tex/utl-shf-period.dat}
+
+\vspace{5mm}
+\subsubsection{Explanation of Variables}
+\begin{description}
+\input{./mf6ivar/tex/utl-shf-desc.tex}
+\end{description}
+
+\vspace{5mm}
+\subsubsection{Example Input File}
+\lstinputlisting[style=inputfile]{./mf6ivar/examples/utl-shf-example.dat}

doc/mf6io/mf6ivar/examples/utl-shf-example.dat

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+BEGIN OPTIONS
+  PRINT_INPUT
+  DENSITY_AIR  1.225
+  HEAT_CAPACITY_AIR  717.0
+  DRAG_COEFFICIENT  0.002
+END OPTIONS
+
+BEGIN PERIOD  1
+  1  WSPD    5.00
+  1  TATM   12.97
+  2  WSPD    4.99
+  2  TATM   12.95
+END PERIOD  1