Clarify touchpad directions;

api/init.lua

@@ -4790,11 +4790,11 @@ return {
             },
             {
               name = "touchx",
-              description = "The x axis of the touchpad."
+              description = "The x axis of the touchpad.  Positive values are to the right."
             },
             {
               name = "touchy",
-              description = "The y axis of the touchpad."
+              description = "The y axis of the touchpad.  Positive values are upwards."
             }
           }
         },

api/lovr/headset/ControllerAxis.lua

@@ -7,11 +7,11 @@ return {
     },
     {
       name = 'touchx',
-      description = 'The x axis of the touchpad.'
+      description = 'The x axis of the touchpad.  Positive values are to the right.'
     },
     {
       name = 'touchy',
-      description = 'The y axis of the touchpad.'
+      description = 'The y axis of the touchpad.  Positive values are upwards.'
     }
   }
 }