Fix broken link: Remove reference to non-existent dynamic_quantizatio… (#3691)

…n recipe

The dynamic_quantization.py recipe file does not exist in the
repository, causing a 404 error when accessing the URL:
https://pytorch.org/tutorials/recipes/recipes/dynamic_quantization.html

Removed references to this missing recipe from:
- recipes_index.rst
- recipes_source/recipes/README.txt

Also renumbered subsequent items in README.txt to maintain sequential
numbering.

Fixes #3503

Fixes #ISSUE_NUMBER

## Description
<!--- Describe your changes in detail -->

## Checklist
<!--- Make sure to add `x` to all items in the following checklist: -->
- [ ] The issue that is being fixed is referred in the description (see
above "Fixes #ISSUE_NUMBER")
- [ ] Only one issue is addressed in this pull request
- [ ] Labels from the issue that this PR is fixing are added to this
pull request
- [ ] No unnecessary issues are included into this pull request.


cc @svekars @sekyondaMeta @AlannaBurke

---------

Co-authored-by: sekyondaMeta <127536312+sekyondaMeta@users.noreply.github.com>

Author: patrocinio

recipes_index.rst

@@ -334,7 +334,6 @@ from our full-length tutorials.
    recipes/recipes/profile_with_itt
    recipes/recipes/Captum_Recipe
    recipes/recipes/tensorboard_with_pytorch
-   recipes/recipes/dynamic_quantization
    recipes/recipes/amp_recipe
    recipes/recipes/tuning_guide
    recipes/recipes/xeon_run_cpu

recipes_source/recipes/README.txt

@@ -12,35 +12,26 @@ PyTorch Recipes
 	 Saving and loading models for inference in PyTorch
          https://pytorch.org/tutorials/recipes/recipes/saving_and_loading_models_for_inference.html
 
-4. custom_dataset_transforms_loader.py
-	 Developing Custom PyTorch Dataloaders
-         https://pytorch.org/tutorials/recipes/recipes/custom_dataset_transforms_loader.html
-
-
-5. Captum_Recipe.py
+4. Captum_Recipe.py
 	 Model Interpretability using Captum
          https://pytorch.org/tutorials/recipes/recipes/Captum_Recipe.html
 
-6. dynamic_quantization.py
-         Dynamic Quantization
-         https://pytorch.org/tutorials/recipes/recipes/dynamic_quantization.html
-
-7. warmstarting_model_using_parameters_from_a_different_model.py
+5. warmstarting_model_using_parameters_from_a_different_model.py
          Warmstarting models using parameters from different model
          https://pytorch.org/tutorials/recipes/recipes/warmstarting_model_using_parameters_from_a_different_model.html
 
-8. zeroing_out_gradients.py
+6. zeroing_out_gradients.py
          Zeroing out gradients
          https://pytorch.org/tutorials/recipes/recipes/zeroing_out_gradients.html
 
-9. mobile_perf.py
+7. mobile_perf.py
          PyTorch Mobile Performance Recipes
          https://pytorch.org/tutorials/recipes/mobile_perf.html
 
-10. amp_recipe.py
+8. amp_recipe.py
          Automatic Mixed Precision
-         https://pytorch.org/tutorials/recipes/amp_recipe.html
+         https://pytorch.org/tutorials/recipes/recipes/amp_recipe.html
 
-11. regional_compilation.py
+9. regional_compilation.py
 	Reducing torch.compile cold start compilation time with regional compilation
          https://pytorch.org/tutorials/recipes/regional_compilation.html