Command \< and \> are not properly shown in section headers (and consequently in index)

In the pdf version of the doxygen manual (version 1.8.6) the commands \< and \> are shown as < and >
Tests (on the doxygen manual) revealed that the exception rules were nor required.
Merge pull request #117 from albert-github/feature/bug_docu_latex

Command \< and \> are not properly shown in section headers (and consequently in index)