Fix duplication typo in stats documentation

[hyanwong]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.91%. Comparing base (25a26a7) to head (b71069d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3357      +/-   ##
==========================================
+ Coverage   89.76%   92.91%   +3.14%     
==========================================
  Files          29       21       -8     
  Lines       31292    15237   -16055     
  Branches     5738     2668    -3070     
==========================================
- Hits        28089    14157   -13932     
+ Misses       1794      608    -1186     
+ Partials     1409      472     -937     

Flag	Coverage Δ
c-tests	?
lwt-tests	80.38% <ø> (ø)
python-c-tests	87.12% <ø> (ø)
python-tests	98.85% <ø> (ø)
python-tests-no-jit	33.51% <ø> (ø)
python-tests-numpy1	50.28% <ø> (ø)

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see 8 files with indirect coverage changes

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