fix return type per audit

Author: Jiarui Guo

sdk/translation/azure-ai-translation-text/src/main/java/com/azure/ai/translation/text/TextTranslationAsyncClient.java

@@ -356,7 +356,7 @@ private Mono<List<TransliteratedText>> transliterateInner(String language, Strin
      * @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent.
      * @return the response.
      */
-    @ServiceMethod(returns = ReturnType.COLLECTION.)
+    @ServiceMethod(returns = ReturnType.SINGLE)
     public Mono<List<TransliteratedText>> transliterate(String language, String fromScript, String toScript,
         List<String> inputs) {
         return transliterateInner(language, fromScript, toScript, convertTextsToInputTextItems(inputs));
@@ -494,7 +494,7 @@ public Mono<Response<BinaryData>> translateWithResponse(BinaryData translateInpu
      * @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent.
      * @return the response body on successful completion of {@link Mono}.
      */
-    @ServiceMethod(returns = ReturnType.COLLECTION)
+    @ServiceMethod(returns = ReturnType.SINGLE)
     public Mono<List<TranslatedTextItem>> translate(List<TranslateInputItem> inputs) {
         // Generated convenience method for translateWithResponse
         RequestOptions requestOptions = new RequestOptions();

sdk/translation/azure-ai-translation-text/src/main/java/com/azure/ai/translation/text/TextTranslationClient.java

@@ -346,7 +346,7 @@ private List<TransliteratedText> transliterateInner(String language, String from
      * @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent.
      * @return the response.
      */
-    @ServiceMethod(returns = ReturnType.COLLECTION)
+    @ServiceMethod(returns = ReturnType.SINGLE)
     public List<TransliteratedText> transliterate(String language, String fromScript, String toScript,
         List<String> inputs) {
         return transliterateInner(language, fromScript, toScript, convertTextsToInputTextItems(inputs));
@@ -482,7 +482,7 @@ public Response<BinaryData> translateWithResponse(BinaryData translateInput, Req
      * @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent.
      * @return the response.
      */
-    @ServiceMethod(returns = ReturnType.COLLECTION)
+    @ServiceMethod(returns = ReturnType.SINGLE)
     public List<TranslatedTextItem> translate(List<TranslateInputItem> inputs) {
         // Generated convenience method for translateWithResponse
         RequestOptions requestOptions = new RequestOptions();