[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/mra.md

@@ -27,24 +27,20 @@ The abstract from the paper is the following:
 This model was contributed by [novice03](https://huggingface.co/novice03).
 The original code can be found [here](https://github.com/mlpen/mra-attention).
 
-
 ## MraConfig
 
 [[autodoc]] MraConfig
 
-
 ## MraModel
 
 [[autodoc]] MraModel
     - forward
 
-
 ## MraForMaskedLM
 
 [[autodoc]] MraForMaskedLM
     - forward
 
-
 ## MraForSequenceClassification
 
 [[autodoc]] MraForSequenceClassification
@@ -55,13 +51,11 @@ The original code can be found [here](https://github.com/mlpen/mra-attention).
 [[autodoc]] MraForMultipleChoice
     - forward
 
-
 ## MraForTokenClassification
 
 [[autodoc]] MraForTokenClassification
     - forward
 
-
 ## MraForQuestionAnswering
 
 [[autodoc]] MraForQuestionAnswering