docs: explanation for max maxReconciliationInterval #5017

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 31s
sample_operators_tests (sample-operators/tomcat-operator)	2m 55s
sample_operators_tests (sample-operators/webpage)	3m 13s
sample_operators_tests (sample-operators/leader-election)	3m 8s
	11m 47s

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