docs: Add `unsafe_update_figure` doc #2602

Job	Run time
changes	4s
filter-release	0s
release	0s
build-main-docs (plotly-express) / check-make-docs	4s
test-python (plotly-express) / test (3.8)	59s
test-python (ui) / test (3.8)	1m 13s
test-python (plotly-express) / test (3.9)	55s
test-python (ui) / test (3.9)	45s
test-python (plotly-express) / test (3.10)	1m 0s
test-python (ui) / test (3.10)	46s
build-main-docs (ui) / check-make-docs	4s
test-python (ui) / test (3.11)	44s
test-python (plotly-express) / test (3.11)	1m 3s
test-python (ui) / test (3.12)	53s
test-python (plotly-express) / test (3.12)	1m 6s
test-js / unit	1m 13s
build-main-docs (plotly-express) / build-plugin / build-python-package	1m 54s
build-main-docs (ui) / build-plugin / build-python-package	1m 41s
test-results	1s
build-main-docs (ui) / main-docs / make-docs	39s
build-main-docs (plotly-express) / main-docs / make-docs	48s
	15m 52s

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