[BUG] - Fix formating

[svekars]

Add Link

https://pytorch.org/tutorials/prototype/fx_graph_mode_quant_guide

Describe the bug

Fix formatting in the tutorial: https://github.com/pytorch/tutorials/blob/main/prototype_source/fx_graph_mode_quant_guide.rst#L73)

Right now only "1.a. Symbolically trace only the code that needs to be quantized" appears due to extraneous ############## lines.

To do:

1. Remove the extraneous ###### lines
2. Remove numbering from the headings.
3. Make editorial changes as needed.
4. Add line breaks where needed. Example:

Describe your environment

Website

cc @carljparker

[fabiogomez11c]

/assigntome

[github-actions]

The issue is already assigned. Please pick an opened and unnasigned issue with the docathon-h1-2023 label.