Tutorial on validation of historical features

[pyalex]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2277 (9a192dc) into master (bb676f2) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head 9a192dc differs from pull request most recent head 9eaa5f5. Consider uploading reports for the commit 9eaa5f5 to get more accurate results

@@            Coverage Diff             @@
##           master    #2277      +/-   ##
==========================================
- Coverage   58.60%   58.59%   -0.01%     
==========================================
  Files         116      116              
  Lines        9810     9811       +1     
==========================================
  Hits         5749     5749              
- Misses       4061     4062       +1     

Flag	Coverage Δ
unittests	58.59% <0.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
.../integration/online_store/test_universal_online.py	14.93% <0.00%> (-0.07%)	⬇️

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[adchia]

/lgtm

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