Update heading name in Fill Triangle usage example description.

src/assets/usage-examples-code/graphics/fill_triangle/fill_triangle-1-basic-red.txt

@@ -1,3 +1,3 @@
-### Fill Triangle
+### Simple Red Triangle
 
 The following code demonstrates how to use the [Fill Triangle](/api/graphics#fill-triangle-3) function to draw a simple red-colored filled triangle. It creates a triangle with specified coordinates and fills it with red color.