fix doc includes unnecessary argument

include/igl/bounding_box_diagonal.h

@@ -16,7 +16,6 @@ namespace igl
   //
   // Inputs:
   //   V  #V by 3 list of vertex positions
-  //   F  #F by 3 list of triangle indices into V
   // Returns length of bounding box diagonal
   IGL_INLINE double bounding_box_diagonal( const Eigen::MatrixXd & V);
 }