fix documentation for zero_shot_object_detection (#28267)

remove broken space

docs/source/en/tasks/zero_shot_object_detection.md

@@ -299,11 +299,3 @@ as before except now there are no labels.
      <img src="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/zero-sh-obj-detection_6.png" alt="Cats with bounding boxes"/>
 </div>
 
-If you'd like to interactively try out inference with OWL-ViT, check out this demo:
-
-<iframe
-	src="https://adirik-owl-vit.hf.space"
-	frameborder="0"
-	width="850"
-	height="450"
-></iframe>