DOC: Correct a typo in issue_triaging.md

[star1327p]

Description

Correct a typo in issue_triaging.md: subscritions -> subscriptions

Checklist

• Follows official PR format
• Includes a sample plot to visually illustrate the changes (only for plot-related functions)
• New features are properly documented (with an example if appropriate)?
• Includes new or updated tests to cover the new feature
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

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📚 Documentation preview 📚: https://arviz--2431.org.readthedocs.build/en/2431/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.75%. Comparing base (fa7d17f) to head (9dba24a).
Report is 18 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2431   +/-   ##
=======================================
  Coverage   86.75%   86.75%           
=======================================
  Files         124      124           
  Lines       12938    12938           
=======================================
  Hits        11224    11224           
  Misses       1714     1714           

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