Fix typo in distplot.py

[jrosellr]

Description

I fixed a typo in plots/distplot.py, changing the description of a ValueError.

Fixes: #1413

Checklist

• Follows official PR format
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

[codecov]

Codecov Report

Merging #1414 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1414   +/-   ##
=======================================
  Coverage   91.62%   91.62%           
=======================================
  Files         105      105           
  Lines       11061    11061           
=======================================
  Hits        10135    10135           
  Misses        926      926           

Impacted Files	Coverage Δ
arviz/plots/distplot.py	90.47% <ø> (ø)

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[OriolAbril]

Thanks for the contribution!

I'll merge once the change is added to the changelog under the maintenance and fixes section.

[jrosellr]

I'm glad to help! I wasn't sure if I had to update the changelog for a typo fix, I listed the changes under Maintenance/Fixes in the unreleased section.

[aloctavodia]

Thanks @JoanRosell for your help. Notice I revert back the title to "Fix typo in distplot.py". That was a good title.