Added ssept model path & citation

[aeroabir]

Description

In the examples\sasrec_amazon.ipynb notebook added the path for SSEPT (Personalized Transformer) model. Also added the citation of the same paper.

Related Issues

NA.

Checklist:

• [ x] I have followed the contribution guidelines and code style for this project.
• [ x] I have added tests covering my contributions.
• [ x] I have updated the documentation accordingly.
• [ x] This PR is being made to staging branch and not to main branch.

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[miguelgfierro]

I added some small comments, but overall is great!

[codecov-commenter]

Codecov Report

Merging #1678 (08a9eba) into staging (93c9df2) will increase coverage by 23.09%.
The diff coverage is 6.66%.

❗ Current head 08a9eba differs from pull request most recent head 19edc07. Consider uploading reports for the commit 19edc07 to get more accurate results

@@             Coverage Diff              @@
##           staging    #1678       +/-   ##
============================================
+ Coverage     0.00%   23.09%   +23.09%     
============================================
  Files           88       87        -1     
  Lines         9101     9106        +5     
============================================
+ Hits             0     2103     +2103     
- Misses           0     7003     +7003     

Flag	Coverage Δ
nightly	?
pr-gate	23.09% <6.66%> (?)

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Impacted Files	Coverage Δ
recommenders/datasets/split_utils.py	68.75% <6.66%> (+68.75%)	⬆️
recommenders/datasets/mind.py	0.00% <0.00%> (ø)
recommenders/datasets/movielens.py	66.37% <0.00%> (+66.37%)	⬆️
recommenders/datasets/download_utils.py	90.00% <0.00%> (+90.00%)	⬆️
recommenders/models/newsrec/io/mind_iterator.py	0.00% <0.00%> (ø)
recommenders/models/newsrec/models/base_model.py	0.00% <0.00%> (ø)
recommenders/__init__.py

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[miguelgfierro]

minor comment

[miguelgfierro]

Geat job @aeroabir