Update legacy API usage in get_started.ipynb (#6932) #11705

Job	Run time
lint-misc	11s
build-data-server-pip (native, ubuntu-20.04, 1.65.0)	1m 8s
lint-python-flake8 (3.9)	15s
build-data-server-pip (native, macos-12, 1.65.0)	1m 41s
lint-frontend	1m 19s
lint-python-flake8 (3.10)	13s
build-data-server-pip (universal, ubuntu-20.04, 1.65.0)	9s
lint-python-yaml-docs	20s
lint-python-flake8 (3.11)	11s
lint-rust (1.65.0, 0.16.1)	31s
build (tf, 3.9)	9m 28s
build (notf, 3.9)	4m 16s
	19m 42s

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