Update doc for keras 3 #423

Job	Run time
type-checking	36s
linters	16s
tests (3.9, ubuntu-latest, true, tf)	16m 51s
tests (3.9, ubuntu-latest, true, torch)	4m 28s
tests (3.9, macos-latest, true, tf)	14m 47s
tests (3.9, macos-latest, true, torch)	7m 44s
tests (3.9, windows-latest, true, tf)	15m 12s
tests (3.9, windows-latest, true, torch)	5m 25s
tests (3.11, ubuntu-latest, true, tf)	13m 6s
tests (3.11, ubuntu-latest, true, torch)	4m 8s
tests (3.11, macos-latest, true, tf)	18m 25s
tests (3.11, macos-latest, true, torch)	6m 55s
tests (3.11, windows-latest, true, tf)	16m 46s
tests (3.11, windows-latest, true, torch)	5m 3s
build-doc / build-doc	1m 12s
deploy-doc	0s
	2h 10m 54s

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