docs: Update _kliep.py

[ymouad]

Wrong index in KLIEP doc

[codecov-commenter]

Codecov Report

Merging #24 (899bb5c) into master (e919420) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #24   +/-   ##
=======================================
  Coverage   94.37%   94.37%           
=======================================
  Files          21       21           
  Lines        2188     2188           
=======================================
  Hits         2065     2065           
  Misses        123      123           

Impacted Files	Coverage Δ
adapt/instance_based/_kliep.py	92.40% <ø> (ø)

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