Update XNNPACK docs to use to_edge_transform_and_lower API (#5344) #4552

Job	Run time
build-benchmark-app / macos-job	22m 45s
build-demo-ios / macos-job	13m 19s
build-frameworks-ios / macos-job	27m 47s
upload-demo-ios	20s
test-demo-ios / mobile-job (ios)	14m 43s
upload-frameworks-ios	22s
	1h 19m 16s

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