#118 docs about enum NodeType{} miss the TINYXML_ prefix

[Ma Anguo]

Same as:
http://sourceforge.net/tracker/?func=detail&atid=113559&aid=3288478&group_id=13559
Once closed, I don't seem to be able to reopen a ticket, so I open a new one.

the fix applied in the other issue was only partial. See other ticket.