rapidxml: fix broken Doxygen comments, indentation
rapidxml: fix broken Doxygen comments, indentation

No "real" source changes in this commit.

m-Schlitzer/ews-cpp,bkircher/ews-cpp,otris/ews-cpp,otris/ews-cpp,m-Schlitzer/ews-cpp,bkircher/ews-cpp,m-Schlitzer/ews-cpp,otris/ews-cpp,bkircher/ews-cpp,otris/ews-cpp