message: Update fespace.hpp
  Added a comment.
diff: @@ -305,13 +305,17 @@ public:
  const FiniteElement *GetTraceElement(int i, int geom_type) const;
  /** Mark degrees of freedom associated with boundary elements with
  - the specified boundary attributes (marked in 'bdr_attr_is_ess'). */
  + the specified boundary attributes (marked in 'bdr_attr_is_ess').
  + For spaces with 'vdim' > 1, the 'component' parameter can be used
  + to restricts the marked vDOFs to the specified component. */
  virtual void GetEssentialVDofs(const Array<int> &bdr_attr_is_ess,
  Array<int> &ess_vdofs,
  int component = -1) const;
  /** Get a list of essential true dofs, ess_tdof_list, corresponding to the
  - boundary attributes marked in the array bdr_attr_is_ess. */
  + boundary attributes marked in the array bdr_attr_is_ess.
  + For spaces with 'vdim' > 1, the 'component' parameter can be used
  + to restricts the marked tDOFs to the specified component. */
  virtual void GetEssentialTrueDofs(const Array<int> &bdr_attr_is_ess,
  Array<int> &ess_tdof_list,
  int component = -1);
  