So, am I correct in saying that this means that the officer on scene never indicated in any paperwork that he thought Z. should be arrested?
That's correct. There is a slot in the form that has to filled in. it describes what is being investigated, not that the infraction being investigated took place. It's a "neutral" entry as far as conclusions go.
Absent an official clarification to the contrary, one would reasonably conclude that to be the case.
A reporter stated that based on the description of the incident on the report, that the officer on scene wished to have Mr. Zimmerman arrested and charged with the “Uniform Crime Code” listed on the report. That is not accurate. (emphasis mine)