docs: Update policy integration.

docs/GettingStarted/integration.md

@@ -158,7 +158,7 @@ auto visitors = std::make_shared<visitor_list>()
     | as_node_with_list_ref<attr_visitor_proxy>()
     | as_node<type_caching_proxy>()
     | as_node_with_list_ref<default_visitor>(
-        mctx, actx, *bld, std::move(mg), std::move(sg), strict_return, missing_return_policy
+        mctx, actx, *bld, std::move(mg), std::move(sg), std::move(policy)
     )
     | optional(enable_unsupported, as_node_with_list_ref<unsup_visitor>(*mctx, *bld))
     | as_node<unreach_visitor>();