langgraph: update docstrings/api ref for functional api #5807

Job	Run time
Check SDK methods matching	7s
lint-js (libs/sdk-js)	20s
test-js (libs/sdk-js)	18s
CLI integration test / CLI integration test (3.10)	4s
cd libs/langgraph / test #3.9	5m 14s
cd libs/scheduler-kafka / test #3.11	2m 3s
CLI integration test / CLI integration test (3.11)	9s
cd libs/langgraph / test #3.10	8m 17s
cd libs/scheduler-kafka / test #3.12	2m 4s
cd libs/langgraph / test #3.11	8m 6s
cd libs/langgraph / test #3.12	8m 50s
cd libs/langgraph / test #3.13	8m 13s
cd libs/checkpoint / lint #3.12	7s
cd libs/checkpoint-postgres / lint #3.12	7s
cd libs/checkpoint-sqlite / lint #3.12	6s
cd libs/cli / lint #3.12	5s
cd libs/langgraph / lint #3.12	1m 5s
cd libs/scheduler-kafka / lint #3.12	7s
cd libs/sdk-py / lint #3.12	4s
cd libs/checkpoint / test #3.9	11s
cd libs/checkpoint-postgres / test #3.9	1m 3s
cd libs/checkpoint / test #3.10	18s
cd libs/checkpoint / test #3.11	17s
cd libs/checkpoint-postgres / test #3.10	2m 3s
cd libs/checkpoint / test #3.12	10s
cd libs/checkpoint-postgres / test #3.11	1m 59s
cd libs/checkpoint / test #3.13	25s
cd libs/checkpoint-postgres / test #3.12	2m 0s
cd libs/checkpoint-postgres / test #3.13	2m 7s
cd libs/checkpoint-sqlite / test #3.9	13s
cd libs/checkpoint-sqlite / test #3.10	15s
cd libs/checkpoint-sqlite / test #3.11	11s
cd libs/checkpoint-sqlite / test #3.12	13s
cd libs/checkpoint-sqlite / test #3.13	19s
cd libs/cli / test #3.9	12s
cd libs/cli / test #3.10	13s
cd libs/cli / test #3.11	10s
cd libs/cli / test #3.12	10s
cd libs/cli / test #3.13	28s
CI Success	1s
	58m 24s

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