[Cory]

I've never been in a situation as a ref where we made a DQ call during the match, unless it was something like the coach touching the controls (automatic DQ).

Any decision to DQ a team is made in the huddle after the match ends, as it's a completely subjective matter.

The notation you saw was probably the ref marking down that something questionable happened so that when it was discussed he/she knew exactly who had done what.