[Docs] Model_doc structure/clarity improvements (#26876)

* first batch of structure improvements for model_docs

* second batch of structure improvements for model_docs

* more structure improvements for model_docs

* more structure improvements for model_docs

* structure improvements for cv model_docs

* more structural refactoring

* addressed feedback about image processors

docs/source/en/model_doc/perceiver.md

@@ -81,7 +81,13 @@ alt="drawing" width="600"/>
 This model was contributed by [nielsr](https://huggingface.co/nielsr). The original code can be found
 [here](https://github.com/deepmind/deepmind-research/tree/master/perceiver).
 
-Tips:
+<Tip warning={true}>
+
+Perceiver does **not** work with `torch.nn.DataParallel` due to a bug in PyTorch, see [issue #36035](https://github.com/pytorch/pytorch/issues/36035)
+
+</Tip>
+
+## Resources
 
 - The quickest way to get started with the Perceiver is by checking the [tutorial
   notebooks](https://github.com/NielsRogge/Transformers-Tutorials/tree/master/Perceiver).
@@ -89,13 +95,6 @@ Tips:
 is implemented in the library. Note that the models available in the library only showcase some examples of what you can do
 with the Perceiver. There are many more use cases, including question answering, named-entity recognition, object detection,
 audio classification, video classification, etc.
-
-**Note**:
-
-- Perceiver does **not** work with `torch.nn.DataParallel` due to a bug in PyTorch, see [issue #36035](https://github.com/pytorch/pytorch/issues/36035)
-
-## Documentation resources
-
 - [Text classification task guide](../tasks/sequence_classification)
 - [Masked language modeling task guide](../tasks/masked_language_modeling)
 - [Image classification task guide](../tasks/image_classification)