docs: fix README callbacks to match current SDK features. (#611) #147

Job	Run time
build-and-test / build-library	19s
build-and-test / build-android	21s
build-and-test / build-ios	1m 14s
build-and-test / check-java-and-kotlin-formatting	19s
build-and-test / test	4s
build-and-test / lint	23s
build-and-test / check-objc-formatting	9s
release-please	10s
publish	0s
	2m 59s

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