[FLINK-34516] Use new CheckpointingMode in flink-core in doc #20

Job	Run time
Default (Java 8) / Compile	35m 36s
Pre-compile Checks / Basic QA	5m 42s
Default (Java 8) / E2E (group 1)	2h 11m 28s
Default (Java 8) / Test (module: core)	35m 52s
Default (Java 8) / E2E (group 2)	2h 19m 38s
Default (Java 8) / Test packaging/licensing	10m 3s
Default (Java 8) / Test (module: python)	18m 46s
Default (Java 8) / Test (module: table)	34m 11s
Default (Java 8) / Test (module: connect)	20m 44s
Default (Java 8) / Test (module: tests)	46m 16s
Default (Java 8) / Test (module: misc)	45m 36s
	8h 43m 52s

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