DOC: fix broken link

[raybellwaves]

Description

Update xclim link

[review-notebook-app]

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[codecov]

Codecov Report

Merging #767 (1956828) into main (dafd1f3) will decrease coverage by 1.03%.
The diff coverage is 90.05%.

@@            Coverage Diff             @@
##             main     #767      +/-   ##
==========================================
- Coverage   93.80%   92.77%   -1.04%     
==========================================
  Files          59       59              
  Lines        6235     6185      -50     
==========================================
- Hits         5849     5738     -111     
- Misses        386      447      +61     

Impacted Files	Coverage Δ
climpred/horizon.py	96.55% <ø> (ø)
climpred/options.py	81.48% <ø> (ø)
climpred/tests/test_bias_removal.py	97.66% <ø> (ø)
climpred/tests/test_hindcast_prediction.py	100.00% <ø> (ø)
climpred/tests/test_logging.py	100.00% <ø> (ø)
climpred/bootstrap.py	80.52% <73.07%> (-10.36%)	⬇️
climpred/alignment.py	91.13% <73.68%> (-5.74%)	⬇️
climpred/checks.py	95.79% <83.33%> (+0.03%)	⬆️
climpred/utils.py	89.58% <83.33%> (-0.81%)	⬇️
climpred/tests/test_HindcastEnsemble_class.py	96.51% <85.71%> (-3.49%)	⬇️
... and 36 more

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