message: Clarify that Indent class is not assumed to encapsulate all printing functionality
diff: @@ -68,6 +68,10 @@ namespace ispc {
  The call to any of Print()/PrintLn() methods does the indentation. Every such
  call must be paired by Done() call when the node is printed.
  +
  + Note that this class is not assumed to encapsulate all printing functionality -
  + Print() member function is responsible for printing indented beginning of the
  + string, but the rest of the string needs to be printed with printf().
  */
  class Indent {
  std::string label;
  