[FLINK-34516] Use new CheckpointingMode in flink-core in doc #22

Job	Run time
Default (Java 8) / Compile	10m 27s
Pre-compile Checks / Basic QA	4m 42s
Default (Java 8) / Test packaging/licensing	10m 7s
Default (Java 8) / E2E (group 1)	1h 42m 3s
Default (Java 8) / Test (module: core)	35m 50s
Default (Java 8) / E2E (group 2)	1h 59m 3s
Default (Java 8) / Test (module: python)	21m 43s
Default (Java 8) / Test (module: table)	33m 30s
Default (Java 8) / Test (module: connect)	19m 58s
Default (Java 8) / Test (module: tests)	46m 48s
Default (Java 8) / Test (module: misc)	44m 7s
	7h 28m 18s

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