Document signals triage update endpoints #17586

Job	Run time
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 21s
test / test (2.7, ubuntu-latest)	2m 11s
examples / examples	2m 46s
pre-commit / pre-commit	1m 8s
test / test (3.2, ubuntu-latest)	1m 31s
report	9s
	11m 6s

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