Document signals triage update endpoints #17570

Job	Run time
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 9s
pre-commit / pre-commit	1m 7s
test / test (3.2, ubuntu-latest)	2m 44s
examples / examples	2m 45s
test / test (2.7, ubuntu-latest)	3m 8s
report	10s
	13m 3s

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