[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/t5v1.1.md

@@ -20,6 +20,10 @@ rendered properly in your Markdown viewer.
 
 T5v1.1 was released in the [google-research/text-to-text-transfer-transformer](https://github.com/google-research/text-to-text-transfer-transformer/blob/main/released_checkpoints.md#t511)
 repository by Colin Raffel et al. It's an improved version of the original T5 model.
+This model was contributed by [patrickvonplaten](https://huggingface.co/patrickvonplaten). The original code can be
+found [here](https://github.com/google-research/text-to-text-transfer-transformer/blob/main/released_checkpoints.md#t511).
+
+## Usage tips
 
 One can directly plug in the weights of T5v1.1 into a T5 model, like so:
 
@@ -59,7 +63,9 @@ Google has released the following variants:
 
 - [google/t5-v1_1-xxl](https://huggingface.co/google/t5-v1_1-xxl).
 
-One can refer to [T5's documentation page](t5) for all tips, code examples and notebooks.
 
-This model was contributed by [patrickvonplaten](https://huggingface.co/patrickvonplaten). The original code can be
-found [here](https://github.com/google-research/text-to-text-transfer-transformer/blob/main/released_checkpoints.md#t511).
+<Tip>
+
+Refer to [T5's documentation page](t5) for all API reference, tips, code examples and notebooks.
+
+</Tip>