Add docs url to flag itself.

dbt/adapters/snowflake/impl.py

@@ -92,6 +92,7 @@ def _behavior_flags(self) -> List[BehaviorFlag]:
                     "benefits only those actively using it, we've made this behavior opt-in to "
                     "prevent unnecessary latency for other users."
                 ),
+                "docs_url": "https://docs.getdbt.com/reference/resource-configs/snowflake-configs#iceberg-table-format",
             }
         ]