docs more spelling fixes (#2499)

examples/widgets/canvas/lv_example_canvas_2.c

@@ -15,7 +15,7 @@ void lv_example_canvas_2(void)
     /*Create a buffer for the canvas*/
     static lv_color_t cbuf[LV_CANVAS_BUF_SIZE_INDEXED_1BIT(CANVAS_WIDTH, CANVAS_HEIGHT)];
 
-    /*Create a canvas and initialize its the palette*/
+    /*Create a canvas and initialize its palette*/
     lv_obj_t * canvas = lv_canvas_create(lv_scr_act());
     lv_canvas_set_buffer(canvas, cbuf, CANVAS_WIDTH, CANVAS_HEIGHT, LV_IMG_CF_INDEXED_1BIT);
     lv_canvas_set_palette(canvas, 0, LV_COLOR_CHROMA_KEY);