[FLINK-34516] Use new CheckpointingMode in flink-core in doc #23

Job	Run time
Default (Java 8) / Compile	10m 5s
Pre-compile Checks / Basic QA	7m 39s
Default (Java 8) / Test packaging/licensing	28m 51s
Default (Java 8) / E2E (group 1)	1h 43m 6s
Default (Java 8) / E2E (group 2)	1h 57m 12s
Default (Java 8) / Test (module: core)	34m 47s
Default (Java 8) / Test (module: python)	16m 42s
Default (Java 8) / Test (module: table)	35m 10s
Default (Java 8) / Test (module: connect)	6m 40s
Default (Java 8) / Test (module: tests)	1h 5m 23s
Default (Java 8) / Test (module: misc)	44m 41s
	7h 50m 16s

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