Add one example on LayerNormalization

[xadupre]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.51%. Comparing base (e649e25) to head (1b20294).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
onnx_diagnostic/helpers/doc_helper.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   76.51%   76.51%   -0.01%     
==========================================
  Files         105      105              
  Lines       10871    10874       +3     
==========================================
+ Hits         8318     8320       +2     
- Misses       2553     2554       +1     

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