PyDoc: Fix warnings from out of bounds include statement

doc/python_api/examples/gpu.1.py

@@ -119,4 +119,24 @@ Examples
 To try these examples, just copy them into Blenders text editor and execute them.
 To keep the examples relatively small, they just register a draw function that can't easily be removed anymore.
 Blender has to be restarted in order to delete the draw handlers.
+
+3D Lines with Single Color
+--------------------------
 """
+
+import bpy
+import gpu
+from gpu_extras.batch import batch_for_shader
+
+coords = [(1, 1, 1), (-2, 0, 0), (-2, -1, 3), (0, 1, 1)]
+shader = gpu.shader.from_builtin('3D_UNIFORM_COLOR')
+batch = batch_for_shader(shader, 'LINES', {"pos": coords})
+
+
+def draw():
+    shader.bind()
+    shader.uniform_float("color", (1, 1, 0, 1))
+    batch.draw(shader)
+
+
+bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')