docs: fix link to kroxy operator #7193

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 42s
sample_operators_tests (sample-operators/webpage)	2m 59s
sample_operators_tests (sample-operators/tomcat-operator)	2m 37s
sample_operators_tests (sample-operators/leader-election)	3m 34s
sample_operators_tests (sample-operators/operations)	8m 18s
	20m 10s

Provide feedback