I don't think there is anything wrong with the OP's actions.
"As an experienced nurse, I know to monitor for increased sediment and/or low out put. I know to encourage fluids and consider irrigation if sediment is heavy. We are perfectly capable of monitoring for hematuria. We monitor for pain as a matter of course. We do not need all these orders placed in the TAR telling us what to do."
As you would have done all of this anyway, why is it a problem that there are actual instructions in the patient's chart? Perhaps, other newer nurses need the instructions. As for being disgruntled about bladder scans, really? What if the catheter really is obstructed, this would be the easiest, fastest way to find out. And, it is likely that you could assign the task to a CNA.
Perhaps the term "PVR" was not the best choice, however, was it really worth nitpicking? So, if you don't like the term the OP used, what would you use? Urinary retention?