Fix checkpoint used in `VisualBertConfig` doc example (#19692)

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

src/transformers/models/visual_bert/configuration_visual_bert.py

@@ -99,7 +99,7 @@ class VisualBertConfig(PretrainedConfig):
     >>> from transformers import VisualBertConfig, VisualBertModel
 
     >>> # Initializing a VisualBERT visualbert-vqa-coco-pre style configuration
-    >>> configuration = VisualBertConfig.from_pretrained("visualbert-vqa-coco-pre")
+    >>> configuration = VisualBertConfig.from_pretrained("uclanlp/visualbert-vqa-coco-pre")
 
     >>> # Initializing a model (with random weights) from the visualbert-vqa-coco-pre style configuration
     >>> model = VisualBertModel(configuration)