[ci skip] improve doc

include/igl/per_face_normals.h

@@ -49,7 +49,6 @@ namespace igl
   /// @param[in] C  #polygons+1 list of cumulative polygon sizes so that C(i+1)-C(i) = size of
   ///     the ith polygon, and so I(C(i)) through I(C(i+1)-1) are the indices of
   ///     the ith polygon
-  /// @param[in] corner_threshold  threshold in degrees on sharp angles
   /// @param[out] N  #polygons by 3 list of per face normals
   /// @param[out] VV  #I+#polygons by 3 list of auxiliary triangle mesh vertex positions
   /// @param[out] FF  #I by 3 list of triangle indices into rows of VV

include/igl/slim.h

@@ -87,7 +87,7 @@ struct SLIMData
 /// Compute necessary information to start using SLIM
 /// 
 /// @param[in] V           #V by 3 list of mesh vertex positions
-/// @param[in] F           #F by 3/3 list of mesh faces (triangles/tets)
+/// @param[in] F           #F by (3|4) list of mesh faces (triangles/tets)
 /// @param[in] V_init      #V by 3 list of initial mesh vertex positions
 /// @param[in,out] data        Precomputation data structure
 /// @param[in] slim_energy Energy to minimize