make temperature.readback show object name

[prjemian]

Check all the notebooks that this change is complete.

[prjemian]

These are the files (via git grep temperature | grep readback):

• [x] describe_instrument.ipynb
• [x] command_review.ipynb
• [x] watch_temperature.ipynb
• [x] after_measurement.ipynb
• [x] lineup_1d_peak.ipynb
• [x] bluesky/custom_plan.ipynb
• [x] resources/example-code/databroker_example.py
• [x] resources/example-code/databroker_example_more.py
• [x] .wip/pack_unpack/unpack.ipynb