Fix jsduck warnings

Change-Id: I7cb183589e897d1fb3923a678e067a21a2ebdf4e
Polish out the TokenTransformManager docs

Includes a change to the docs for addTransform, which I'll use to document the
handler methods in the next patch.

Change-Id: I5948ea6045e0228bfea28da40e2ffff27f54b091
Merge changes I5948ea60,I7cb18358

* changes:
  Polish out the TokenTransformManager docs
  Fix jsduck warnings