message: Improve Doxygen comments for Mesh::GetNodes and related functions
diff: @@ -1576,6 +1576,10 @@ public:
  void SetNodes(const Vector &node_coord);
  /// Return a pointer to the internal node GridFunction (may be NULL).
  + /** If the mesh is straight-sided (low-order), it may not have a GridFunction
  + for the nodes, in which case this function returns NULL. To ensure that
  + the nodal GridFunction exists, call EnsureNodes().
  + @sa SetCurvature(). */
  GridFunction *GetNodes() { return Nodes; }
  const GridFunction *GetNodes() const { return Nodes; }
  /// Return the mesh nodes ownership flag.
  @@ -1603,15 +1607,22 @@ public:
  /** Return the FiniteElementSpace on which the current mesh nodes are
  defined or NULL if the mesh does not have nodes. */
  const FiniteElementSpace *GetNodalFESpace() const;
  - /** Make sure that the mesh has valid nodes, i.e. its geometry is described
  - by a vector finite element grid function (even if it is a low-order mesh
  - with straight edges). */
  + /** @brief Make sure that the mesh has valid nodes, i.e. its geometry is
  + described by a vector finite element grid function (even if it is a
  + low-order mesh with straight edges).
  +
  + @sa GetNodes(). */
  void EnsureNodes();
  - /** Set the curvature of the mesh nodes using the given polynomial degree,
  - 'order', and optionally: discontinuous or continuous FE space, 'discont',
  - new space dimension, 'space_dim' (if != -1), and 'ordering' (byVDim by
  - default). */
  + /// Set the curvature of the mesh nodes using the given polynomial degree.
  + /** Creates a nodal GridFunction if one doesn't already exist.
  +
  + @param[in] order Polynomial degree of the nodal FE space.
  + @param[in] discont Whether to use a discontinuous or continuous
  + finite element space (continuous is default).
  + @param[in] space_dim The space dimension (optional).
  + @param[in] ordering The Ordering of the finite element space
  + (Ordering::byVDIM is the default). */
  virtual void SetCurvature(int order, bool discont = false, int space_dim = -1,
  int ordering = 1);
  