[FLINK-36941][docs] Update DATE_FORMAT Doc and Python Tests #3

Job	Run time
Pre-compile Checks / Basic QA	7m 3s
Default (Java 8) / Compile	30m 14s
Default (Java 8) / Test packaging/licensing	37m 24s
Default (Java 8) / E2E (group 1)	2h 20m 12s
Default (Java 8) / Test (module: core)	35m 52s
Default (Java 8) / Test (module: python)	9m 54s
Default (Java 8) / E2E (group 2)	2h 27m 43s
Default (Java 8) / Test (module: table)	59m 1s
Default (Java 8) / Test (module: connect)	19m 29s
Default (Java 8) / Test (module: tests)	46m 31s
Default (Java 8) / Test (module: misc)	46m 21s
	9h 39m 44s

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