The types that use the "<" or ">" characters are shown wrongly in the documentation pop-up, the one that appears when you push [CONTROL] + [SPACE] to get the auto-completion. I'm not referring to the pop-up where you actually choose the function, but the one which shows you the documentation to the functions list.

This happens when you document an Array using the <> syntax or an Object that works as a dictionary or map of keys and values:

  Array<String>
  Array.<String>
  Object<String,Student>
  Object.<String,Student>

In the case of the Array you can use this alternative syntax:

  String[]

But in the case of the Object, you can only use the one above, so you're much more limited.

In the pop-up where you choose the function, the type is shown right. So I guess that it has to do with the parsing of the HTML in the documentation pop-up, which interprets the "<" and ">" characters as tag delimiters, and hides what is inside of them. If I use the "&lt;" and "&gt;" HTML sequences, the characters are shown right in the pop-up (but not in the auto-completion pop-up, obviously).