docs: fix the link to the API docs in README.md #286

Job	Run time
lint	16s
build-ubuntu (18)	2m 6s
build-ubuntu (20)	2m 16s
build-ubuntu (22)	2m 22s
build-ubuntu (23)	2m 53s
test-ee	1m 29s
test-lowest-supported-server	1m 37s
test-ce (18)	1m 56s
test-ce-latest-release	0s
test-ce (20)	1m 49s
test-valgrind (20)	2m 28s
test-ce (22)	1m 55s
test-ce (23)	2m 3s
	23m 10s

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