fix: ensure deprecated annotations always include message for TSDoc compliance

Author: aBurmeseDev

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptWriter.java

@@ -227,8 +227,8 @@ boolean writeShapeDocs(Shape shape, UnaryOperator<String> preprocessor) {
                         String deprecationMessage = deprecatedTrait.getMessage()
                             .map(msg -> " " + msg) 
                             .orElse(" see description");
-                        String deprecationString = deprecatedTrait.getMessage().isPresent() ? "@deprecated" + deprecationMessage : "@deprecated"; 
-                        docs = docs + "\n\n" + deprecationString;
+                        String deprecationAnnotation = "@deprecated " + deprecationMessage; 
+                        docs = docs + "\n\n" + deprecationAnnotation;
                     }
                     docs = preprocessor.apply(docs);
                     docs = addReleaseTag(shape, docs);