[quant][pt2e][tutorials] Some fixes to pt2e quant docs (#2513)

* [quant][pt2e][tutorials] Some fixes to pt2e quant docs
---------

Co-authored-by: Svetlana Karslioglu <svekars@fb.com>

Author: jerryzh168

prototype_source/pt2e_quant_ptq_static.rst

@@ -302,12 +302,13 @@ For post training quantization, we'll need to set model to the eval mode.
 ``Quantizer`` is backend specific, and each ``Quantizer`` will provide their own way to allow users to configure their model. Just as an example, here is the different configuration APIs supported by XNNPackQuantizer:
 
 .. code:: python
+
   quantizer.set_global(qconfig_opt)  # qconfig_opt is an optional qconfig, either a valid qconfig or None
       .set_object_type(torch.nn.Conv2d, qconfig_opt) # can be a module type
       .set_object_type(torch.nn.functional.linear, qconfig_opt) # or torch functional op      
       .set_module_name("foo.bar", qconfig_opt)
 
-We have another `tutorial <https://pytorch.org/tutorials/prototype/quantization_in_pytorch_2_0_export_tutorial.html>`_ that talks about how to write a new ``Quantizer``.
+We have another `tutorial <https://pytorch.org/tutorials/prototype/pt2e_quantizer.html>`_ that talks about how to write a new ``Quantizer``.
 
 6. Prepare the Model for Post Training Static Quantization
 ----------------------------------------------------------
@@ -396,6 +397,7 @@ quantization you are using to learn more about how you can have more control ove
 We'll show how to save and load the quantized model.
 
 .. code:: python
+
     # 1. Save state_dict
     pt2e_quantized_model_file_path = saved_model_dir + "resnet18_pt2e_quantized.pth"
     torch.save(quantized_model.state_dict(), pt2e_quantized_model_file_path)
@@ -434,6 +436,7 @@ We'll show how to save and load the quantized model.
 
 11. Debugging Quantized Model
 ----------------------------
+
 We have `Numeric Suite <https://pytorch.org/docs/stable/quantization-accuracy-debugging.html#numerical-debugging-tooling-prototype>`_ that can help with debugging in eager mode and FX graph mode. The new version of Numeric Suite working with PyTorch 2.0 Export models is still in development.
 
 12. Lowering and Performance Evaluation

prototype_source/pt2e_quantizer.rst

@@ -10,12 +10,16 @@ Prerequisites:
 
 Required:
 -  `Torchdynamo concepts in PyTorch <https://pytorch.org/docs/stable/dynamo/index.html>`__
+   
 -  `Quantization concepts in PyTorch <https://pytorch.org/docs/master/quantization.html#quantization-api-summary>`__
+   
 -  `(prototype) PyTorch 2.0 Export Post Training Static Quantization <https://pytorch.org/tutorials/prototype/pt2e_quant_ptq_static.html>`__
 
 Optional:
 -  `FX Graph Mode post training static quantization <https://pytorch.org/tutorials/prototype/fx_graph_mode_ptq_static.html>`__
+   
 -  `BackendConfig in PyTorch Quantization FX Graph Mode <https://pytorch.org/tutorials/prototype/backend_config_tutorial.html?highlight=backend>`__
+   
 -  `QConfig and QConfigMapping in PyTorch Quantization FX Graph Mode <https://pytorch.org/tutorials/prototype/backend_config_tutorial.html#set-up-qconfigmapping-that-satisfies-the-backend-constraints>`__   
 
 Introduction
@@ -25,12 +29,12 @@ Introduction
 (1). What is supported quantized operator or patterns in the backend
 (2). How can users express the way they want their floating point model to be quantized, for example, quantized the whole model to be int8 symmetric quantization, or quantize only linear layers etc.
 
-Please see `here <https://pytorch.org/tutorials/prototype/pt2e_quant_ptq_static.html>`__ For motivations for ``Quantizer``.
+Please see `here <https://pytorch.org/tutorials/prototype/pt2e_quant_ptq_static.html#motivation-of-pytorch-2-0-export-quantization>`__ For motivations for the new API and ``Quantizer``.
 
 An existing quantizer object defined for ``XNNPACK`` is in
 `QNNPackQuantizer <https://github.com/pytorch/pytorch/blob/main/torch/ao/quantization/pt2e/quantizer/xnnpack_quantizer.py>`__
 
-Annotation API:
+Annotation API
 ^^^^^^^^^^^^^^^^^^^
 
 ``Quantizer`` uses annotation API to convey quantization intent for different operators/patterns.
@@ -269,4 +273,4 @@ Conclusion
 With this tutorial, we introduce the new quantization path in PyTorch 2.0. Users can learn about
 how to define a ``BackendQuantizer`` with the ``QuantizationAnnotation API`` and integrate it into the quantization 2.0 flow.
 Examples of ``QuantizationSpec``, ``SharedQuantizationSpec``, ``FixedQParamsQuantizationSpec``, and ``DerivedQuantizationSpec``
-are given for specific annotation use case. This is a prerequisite to be able to quantize a model in PyTorch 2.0 Export Quantization flow. Please follow `this tutorial <https://pytorch.org/tutorials/prototype/pt2e_quant_ptq_static.html>`_ to actually quantize a model.
+are given for specific annotation use case. This is a prerequisite to be able to quantize a model in PyTorch 2.0 Export Quantization flow. You can use `XNNPACKQuantizer <https://github.com/pytorch/pytorch/blob/main/torch/ao/quantization/quantizer/xnnpack_quantizer.py>`_ as an example to start implementing your own ``Quantizer``. After that please follow `this tutorial <https://pytorch.org/tutorials/prototype/pt2e_quant_ptq_static.html>`_ to actually quantize your model.