Fix credible interval percentage in plot loo pit legend

[Rishabh261998]

Description

Fix credible interval percentage in plot_loo_pit legend

Before:

After:

Checklist

• Follows official PR format
• Includes a sample plot to visually illustrate the changes (only for plot-related functions)
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

[aloctavodia]

Good catch! Could you also update the changelog?

[Rishabh261998]

Done!

[codecov]

Codecov Report

Merging #1745 (0eaedf0) into main (86e06d8) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 0eaedf0 differs from pull request most recent head b4353e8. Consider uploading reports for the commit b4353e8 to get more accurate results

@@           Coverage Diff           @@
##             main    #1745   +/-   ##
=======================================
  Coverage   90.87%   90.87%           
=======================================
  Files         109      109           
  Lines       11844    11844           
=======================================
  Hits        10763    10763           
  Misses       1081     1081           

Impacted Files	Coverage Δ
arviz/plots/backends/bokeh/loopitplot.py	95.29% <100.00%> (ø)
arviz/plots/backends/matplotlib/loopitplot.py	86.36% <100.00%> (ø)

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[canyon289]

Thanks!