Fix TextureData:setPixel language;

api/lovr/data/TextureData/setPixel.lua

@@ -5,12 +5,12 @@ return {
     {
       name = 'x',
       type = 'number',
-      description = 'The x coordinate of the pixel to get (0-indexed).'
+      description = 'The x coordinate of the pixel to set (0-indexed).'
     },
     {
       name = 'y',
       type = 'number',
-      description = 'The y coordinate of the pixel to get (0-indexed).'
+      description = 'The y coordinate of the pixel to set (0-indexed).'
     },
     {
       name = 'r',