docs: remove javadoc todos #4791

Job	Run time
check_format_and_unit_tests	1m 58s
special_integration_tests (17)	2m 24s
special_integration_tests (21)	2m 14s
httpclient-tests (jdk) / integration_tests	22m 31s
httpclient-tests (jetty) / integration_tests	22m 52s
httpclient-tests (vertx) / integration_tests	21m 11s
integration_tests (17, 1.30.3) / integration_tests	21m 33s
integration_tests (17, 1.31.0) / integration_tests	23m 9s
integration_tests (17, v1.28.12) / integration_tests	21m 40s
integration_tests (17, v1.29.7) / integration_tests	22m 45s
integration_tests (21, 1.31.0) / integration_tests	23m 13s
integration_tests (21, 1.30.3) / integration_tests	21m 40s
integration_tests (21, v1.28.12) / integration_tests	21m 32s
integration_tests (21, v1.29.7) / integration_tests	22m 0s
	4h 10m 42s

Provide feedback