typo

Author: thomas-k-cameron

codegen-client/src/main/kotlin/software/amazon/smithy/rust/codegen/client/smithy/generators/client/FluentClientGenerator.kt

@@ -343,7 +343,7 @@ class FluentClientGenerator(
             //      | |_____________^ duplicate definitions for `set_fields`
             if (inputBuilderType.toString().endsWith("Builder")) {
                 rustTemplate("""
-                    ##[#{Unstable}]
+                    ##[#{AwsSdkUnstableAttribute}]
                     /// This function replaces the parameter with new one.
                     /// It is useful when you want to replace the existing data with de-serialized data.
                     /// ```compile_fail