Update reference.md

Author: rmca14

articles/cognitive-services/translator-speech/reference.md

@@ -175,7 +175,7 @@ When a client application has finished streaming audio and has received the last
 |X-ClientVersion|(empty)	|Identifies the version of the client application. Example: "2.1.0.123".<br/>Instead of using a header, this value can be passed with query parameter `X-ClientVersion`. If both header and query paramter are set, then the query parameter is ignored.|header|string|
 |X-OsPlatform|(empty)	|Identifies the name and version of the operating system the client application is running on. Examples: "Android 5.0", "iOs 8.1.3", "Windows 8.1".<br/>Instead of using a header, this value can be passed with query parameter `X-OsPlatform`. If both header and query paramter are set, then the query parameter is ignored.|header|string|
 
-### Response Messages
+### Response messages
 
 |HTTP Status Code|Reason|Response Model|Headers|
 |:--|:--|:--|:--|