unify all doc link to flink-docs-release-1.19 #17

Job	Run time
Default (Java 8) / Compile	10m 11s
Pre-compile Checks / Basic QA	8m 50s
Default (Java 8) / Test packaging/licensing	33m 10s
Default (Java 8) / Test (module: core)	34m 56s
Default (Java 8) / E2E (group 1)	1h 42m 42s
Default (Java 8) / Test (module: python)	30m 24s
Default (Java 8) / E2E (group 2)	2h 0m 41s
Default (Java 8) / Test (module: table)	30m 28s
Default (Java 8) / Test (module: connect)	20m 17s
Default (Java 8) / Test (module: tests)	43m 48s
Default (Java 8) / Test (module: misc)	46m 46s
	8h 2m 13s

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