Document SendSecurityMonitoringNotificationPreview endpoint #18468

Job	Run time
examples / examples	3m 8s
test / test (3.2, ubuntu-latest)	3m 53s
pre-commit / pre-commit	1m 23s
test / test (2.7, ubuntu-latest)	3m 37s
test / test (jruby-9.4.12.0, ubuntu-latest)	4m 6s
report	10s
report	10s
examples / examples	3m 8s
pre-commit / pre-commit	1m 23s
test / test (2.7, ubuntu-latest)	3m 37s
test / test (3.2, ubuntu-latest)	3m 53s
test / test (jruby-9.4.12.0, ubuntu-latest)	4m 6s
	32m 34s

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