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Fix link in gql_error_link/README.md #933

Job	Run time
publish_dry_run	19s
Check end_to_end_test	1m 1s
Check gql_example_cli	46s
Check end_to_end_test_tristate	58s
Check gql_example_cli_github	57s
Check gql	40s
Check gql_exec	31s
Check gql_example_build	47s
Check gql_code_builder_serializers	25s
Check gql_example_http_auth_link	28s
Check gql_build	33s
Check gql_example_dio_link	25s
Check gql_code_builder	50s
Check gql_link	25s
Check gql_dedupe_link	35s
Check gql_dio_link	49s
Check gql_error_link	33s
Check gql_http_link	49s
Check gql_websocket_link	1m 14s
Check gql_transform_link	35s
Check gql_tristate_value	31s
	14m 11s

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