[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/electra.md

@@ -50,7 +50,9 @@ using 30x more compute) on the GLUE natural language understanding benchmark. Ou
 where it performs comparably to RoBERTa and XLNet while using less than 1/4 of their compute and outperforms them when
 using the same amount of compute.*
 
-Tips:
+This model was contributed by [lysandre](https://huggingface.co/lysandre). The original code can be found [here](https://github.com/google-research/electra).
+
+## Usage tips
 
 - ELECTRA is the pretraining approach, therefore there is nearly no changes done to the underlying model: BERT. The
   only change is the separation of the embedding size and the hidden size: the embedding size is generally smaller,
@@ -66,9 +68,7 @@ Tips:
   [`ElectraForPreTraining`] model (the classification head will be randomly initialized as it
   doesn't exist in the generator).
 
-This model was contributed by [lysandre](https://huggingface.co/lysandre). The original code can be found [here](https://github.com/google-research/electra).
-
-## Documentation resources
+## Resources
 
 - [Text classification task guide](../tasks/sequence_classification)
 - [Token classification task guide](../tasks/token_classification)
@@ -95,6 +95,9 @@ This model was contributed by [lysandre](https://huggingface.co/lysandre). The o
 
 [[autodoc]] models.electra.modeling_tf_electra.TFElectraForPreTrainingOutput
 
+<frameworkcontent>
+<pt>
+
 ## ElectraModel
 
 [[autodoc]] ElectraModel
@@ -135,6 +138,9 @@ This model was contributed by [lysandre](https://huggingface.co/lysandre). The o
 [[autodoc]] ElectraForQuestionAnswering
     - forward
 
+</pt>
+<tf>
+
 ## TFElectraModel
 
 [[autodoc]] TFElectraModel
@@ -170,6 +176,9 @@ This model was contributed by [lysandre](https://huggingface.co/lysandre). The o
 [[autodoc]] TFElectraForQuestionAnswering
     - call
 
+</tf>
+<jax>
+
 ## FlaxElectraModel
 
 [[autodoc]] FlaxElectraModel
@@ -209,3 +218,6 @@ This model was contributed by [lysandre](https://huggingface.co/lysandre). The o
 
 [[autodoc]] FlaxElectraForQuestionAnswering
     - __call__
+
+</jax>
+</frameworkcontent>