docs: document annotation-based dependent resource configuration #5190

Job	Run time
sample_operators_tests (sample-operators/webpage)	2m 49s
sample_operators_tests (sample-operators/tomcat-operator)	2m 30s
sample_operators_tests (sample-operators/mysql-schema)	2m 36s
sample_operators_tests (sample-operators/leader-election)	3m 2s
	10m 57s

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