fix: typos in Sample annotations (#3108) #6086

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 19s
sample_operators_tests (sample-operators/leader-election)	3m 17s
sample_operators_tests (sample-operators/tomcat-operator)	3m 2s
sample_operators_tests (sample-operators/mysql-schema)	3m 3s
	12m 41s

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