docs: Update API documentation link in README #530

Job	Run time
spm-test	6m 6s
test (platform=iOS\ Simulator,name=iPhone\ 14\ Pro\ Max, test)	12m 57s
linux	3m 15s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	8m 49s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 5\ \(40mm\), build)	4m 31s
windows	4m 23s
test (platform=macOS, test)	7m 36s
docs	1m 52s
cocoapods	8m 53s
xcode-test-5_5	1m 22s
	59m 44s

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