clang-tidy bugprone-argument-comment check template arguments

Catching the problem in the following example would be a useful addition to the `bugprone-argument-comment` rule:

```
template class C {};
int main() {
// Should produce a warning, as order is swapped:
C xxx;
}
```

currently produces no warning:

```
$ clang-tidy --checks=bugprone-argument-comment ./test.cpp
... (no warning printed)
```

Reproduce the example in test.cpp with clang-tidy --checks=bugprone-argument-comment and confirm that swapped template arguments produce no warning. Start by locating the bugprone-argument-comment check implementation and its existing tests; done means the shown template-argument case emits the expected diagnostic without breaking current cases.

Written by the indexing model from the issue text.