It is well known from the education literature that the best way to learn and retain something is to teach it. Offering to research questions that come up on rounds and giving brief (5-10 min) presentations is both an outstanding way to learn and it makes the team very aware of your enthusiasm and practice-based learning. The documentation for this activity could be a handout or powerpoint you made with a brief note of the context of the presentation. But, fancy powpoint presentations are not assumed to be better than a blackboard talk in your team room. If you did not prepare a specific handout, simply describe what you did and why in a couple of sentences.