AudioProcessorParameter: Fix documentation

modules/juce_audio_processors/processors/juce_AudioProcessorParameter.h

@@ -178,9 +178,9 @@ public:
 
     enum Category
     {
-        genericParameter = (0 << 16) | 0,        /** If your parameter is not a meter then you should use this category */
+        genericParameter = (0 << 16) | 0,        /**< If your parameter is not a meter then you should use this category */
 
-        inputGain        = (1 << 16) | 0,        /** Currently not used */
+        inputGain        = (1 << 16) | 0,        /**< Currently not used */
         outputGain       = (1 << 16) | 1,
 
         /** The following categories tell the host that this parameter is a meter level value