PyDoc: Fix warnings from out of bounds include statement

doc/python_api/examples/gpu.6.py

@@ -1,25 +1,36 @@
 """
-2D Rectangle
-------------
+2D Image
+--------
+
+To use this example you have to provide an image that should be displayed.
 """
 import bpy
 import gpu
+import bgl
 from gpu_extras.batch import batch_for_shader
 
-vertices = (
-    (100, 100), (300, 100),
-    (100, 200), (300, 200))
+IMAGE_NAME = "Untitled"
+image = bpy.data.images[IMAGE_NAME]
 
-indices = (
-    (0, 1, 2), (2, 1, 3))
+shader = gpu.shader.from_builtin('2D_IMAGE')
+batch = batch_for_shader(
+    shader, 'TRI_FAN',
+    {
+        "pos": ((100, 100), (200, 100), (200, 200), (100, 200)),
+        "texCoord": ((0, 0), (1, 0), (1, 1), (0, 1)),
+    },
+)
 
-shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
-batch = batch_for_shader(shader, 'TRIS', {"pos": vertices}, indices=indices)
+if image.gl_load():
+    raise Exception()
 
 
 def draw():
+    bgl.glActiveTexture(bgl.GL_TEXTURE0)
+    bgl.glBindTexture(bgl.GL_TEXTURE_2D, image.bindcode)
+
     shader.bind()
-    shader.uniform_float("color", (0, 0.5, 0.5, 1.0))
+    shader.uniform_int("image", 0)
     batch.draw(shader)