TF - Fix convnext classification example (huggingface#17261)

Author: gante

src/transformers/models/convnext/modeling_tf_convnext.py

@@ -537,7 +537,7 @@ def call(
         >>> image = Image.open(requests.get(url, stream=True).raw)
 
         >>> feature_extractor = ConvNextFeatureExtractor.from_pretrained("facebook/convnext-tiny-224")
-        >>> model = TFViTForImageClassification.from_pretrained("facebook/convnext-tiny-224")
+        >>> model = TFConvNextForImageClassification.from_pretrained("facebook/convnext-tiny-224")
 
         >>> inputs = feature_extractor(images=image, return_tensors="tf")
         >>> outputs = model(**inputs)