Documentation Update

- Added a task-tutorial man page mention to the help and version command.
- Corrected comment about attribute entity encoding/decoding.

src/Att.cpp

@@ -742,7 +742,8 @@ void Att::dequote (std::string& value) const
 ////////////////////////////////////////////////////////////////////////////////
 // Encode values prior to serialization.
 //   \t -> &tab;
-//   "  -> "
+//   '  -> &squot;
+//   "  -> &dquot;
 //   ,  -> ,
 //   [  -> &open;
 //   ]  -> &close;