Fixups to example notebook for new APIs

[bpkroth]

• enable notebook execution in CI pipelines to prevent these mistakes in the future

[bpkroth]

Need something like the following next:

make notebook-test
# which runs in the CI pipeline
# and does something like the following
find . -name '*.ipynb' -print0 | xargs -t -P0 -0 -n1 python -m jupyter execute

[bpkroth]

Should really enable this for some of the example repos as well.