Signature help doesn't show the doxygen tparam info

[sean-mcmanus]

Repro with

/**
 * @tparam T1,T2 too
 */
template<typename T1, typename T2>
int func(int x, int y) {
    return func< // signature help here
}

It works for param doxygen comments and hover with tparam.

[sean-mcmanus]

I filed a VS bug at https://developercommunity.visualstudio.com/t/C-signature-help-doesnt-show-doxygen/10922436 (shared component).