[quant][pt2e] Add documentation for pt2 export static quant (#2512)

Add pt2 export docs
Renames the current pt2e tutorial

Author: jerryzh168

prototype_source/fx_graph_mode_ptq_static.rst

@@ -241,8 +241,8 @@ of the observers for activation and weight. ``QConfigMapping`` contains mapping
 
   qconfig_mapping = (QConfigMapping()
       .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 callable...
-      .set_object_type("torch.nn.functional.add", qconfig_opt) # ...or a string of the class name
+      .set_object_type(torch.nn.Conv2d, qconfig_opt)  # can be a callable...
+      .set_object_type("reshape", qconfig_opt)  # ...or a string of the method
       .set_module_name_regex("foo.*bar.*conv[0-9]+", qconfig_opt) # matched in order, first match takes precedence
       .set_module_name("foo.bar", qconfig_opt)
       .set_module_name_object_type_order()

prototype_source/prototype_index.rst

@@ -69,12 +69,19 @@ Prototype features are not available as part of binary distributions like PyPI o
    :tags: Debugging,Quantization
 
 .. customcarditem::
-   :header: Quantization in PyTorch 2.0 Export Tutorial
-   :card_description: Learn how to use the Quantization in PyTorch 2.0 Export.
+   :header: How to Write a Quantizer for PyTorch 2.0 Export Quantization
+   :card_description: Learn how to implement a Quantizer for PT2.0 Export Quantization
    :image: ../_static/img/thumbnails/cropped/generic-pytorch-logo.png
-   :link: ../prototype/quantization_in_pytorch_2_0_export_tutorial.html
+   :link: ../prototype/pt2e_quantizer.html
    :tags: Quantization
 
+.. customcarditem::
+   :header: PyTorch 2.0 Export Post Training Static Quantization
+   :card_description: Learn how to use Post Training Static Quantization in PyTorch 2.0 Export.
+   :image: ../_static/img/thumbnails/cropped/generic-pytorch-logo.png
+   :link: ../prototype/pt2e_quant_ptq_static.html
+   :tags: Quantization          
+
 .. Mobile
 
 .. customcarditem::