\param Comment a \c CXComment_TParamCommand AST node.
\returns zero-based nesting depth of this parameter in the template parameter list.
For example,
\verbatim
template<typename C, template<typename T> class TT>
void test(TT<int> aaa);
\endverbatim
for C and TT nesting depth is 0,
for T nesting depth is 1.
\param Comment a \c CXComment_TParamCommand AST node.
\returns zero-based nesting depth of this parameter in the template parameter list.
For example, \verbatim template<typename C, template<typename T> class TT> void test(TT<int> aaa); \endverbatim for C and TT nesting depth is 0, for T nesting depth is 1.