chore: Fix RPC document issues #2054

Job	Run time
e2e test for 3-nodes-transfer --env test	4m 17s
e2e test for invoice-ops --env test	3m 57s
e2e test for open-use-close-a-channel --env test	4m 0s
e2e test for udt --env test	4m 16s
e2e test for reestablish --env test	4m 1s
e2e test for cross-chain-hub --env test	4m 24s
e2e test for router-pay --env test	5m 6s
e2e test for udt-router-pay --env test	4m 13s
e2e test for watchtower --env test	5m 37s
e2e test for udt --env xudt-test	4m 16s
e2e test for 3-nodes-transfer --env test --env-var HASH_ALGORITHM=sha256	4m 29s
	48m 36s

Provide feedback