fixed copy-paste mistake.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@8305 2fb0f335-1f38-0410-981e-8018bf24f1b0

doc/handbook/fluidframework.tex

@@ -94,7 +94,7 @@ Also, {\bf all} fluid states {\bf must} provide the following methods:
   $x^\kappa_\alpha$ is defined as the ratio of the number of molecules
   of component $\kappa$ and the total number of molecules of the phase
   $\alpha$.
-\item[moleFraction():] Returns the mass fraction $X^\kappa_\alpha$ of
+\item[massFraction():] Returns the mass fraction $X^\kappa_\alpha$ of
   component $\kappa$ in fluid phase $\alpha$. The mass fraction
   $X^\kappa_\alpha$ is defined as the weight of all molecules of a
   component divided by the total mass of the fluid phase. It is