[docs] fix example code bug

[faaany]

What does this PR do?

The current code example will give me the following error:

Traceback (most recent call last):
  File "/home/sdp/fanli/transformers/playground.py", line 110, in <module>
    for value in generator:
  File "/home/sdp/fanli/transformers/playground.py", line 80, in model_inference
    inputs = processor(
  File "/home/sdp/fanli/transformers/src/transformers/models/idefics2/processing_idefics2.py", line 227, in __call__
    raise ValueError(
ValueError: The total number of <image> tokens in the prompts should be the same as the number of images passed. Found 3 <image> tokens and 2 images.

This is because the messages were used in the previous example, while in this example an additional prompt is added.

Documentation: @stevhliu

[stevhliu]

Good catch, thank you!

[HuggingFaceDocBuilderDev]

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