update parallel XEB notebook

[NoureldinYosri]

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[NoureldinYosri]

@eliottrosenberg I don't know if this is enough or not. how do you think we should modify the notebooks?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.76%. Comparing base (2700f95) to head (19fc664).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6494   +/-   ##
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  Coverage   97.75%   97.76%           
=======================================
  Files        1105     1105           
  Lines       95030    95030           
=======================================
+ Hits        92898    92902    +4     
+ Misses       2132     2128    -4     

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[eliottrosenberg]

@eliottrosenberg I don't know if this is enough or not. how do you think we should modify the notebooks?

I think this is basically sufficient. I added a few small suggestions.