Fix mixed tabs/spaces indentation in organizations example RST files

[nivtrips]

The Paths field and surrounding lines in describe-account.rst, list-accounts.rst, and list-accounts-for-parent.rst used spaces instead of tabs, causing misaligned rendering on GitHub.

Issue #, if available:

Description of changes:

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.43%. Comparing base (c4681b5) to head (da450b8).
⚠️ Report is 339 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10289      +/-   ##
===========================================
+ Coverage    93.39%   93.43%   +0.04%     
===========================================
  Files          210      211       +1     
  Lines        17052    17283     +231     
===========================================
+ Hits         15925    16149     +224     
- Misses        1127     1134       +7     

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