change reference location for the HB_solver details

doc/input.tex

@@ -423,7 +423,6 @@ \subsection{Input parameter for main program}
   \]
 \end{itemize}
 Each of them has different options
-\footnote{Please see sec. \ref{sec:hb.solver} for details about the heatbath solver.}
 :
 \begin{itemize}
 \item {\ttfamily DET, CLOVERDET}:
@@ -452,6 +451,7 @@ \subsection{Input parameter for main program}
   \item {\ttfamily MaxSolverIterations}: default is $5000$
   \item {\ttfamily Solver}: the solver to be used, either CG or
     BiCGstab. Default is CG.
+  \item {\ttfamily HB\_Solver}: the solver to be used in the heatbath step, see section \ref{sec:hb.solver} for details.
   \item {\ttfamily Name}: a name to be assigned to the monomial. The
     default is {\ttfamily DET}
   \end{itemize}