📖 Fix typo for a link ref in derive-service-account.md

[tlwu2013]

Description

Fix a typo for a link ref in the doc (derive-service-account.md)

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.83%. Comparing base (d262e32) to head (25cdaac).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
+ Coverage   74.67%   74.83%   +0.15%     
==========================================
  Files          42       42              
  Lines        2515     2515              
==========================================
+ Hits         1878     1882       +4     
+ Misses        451      449       -2     
+ Partials      186      184       -2     

Flag	Coverage Δ
e2e	56.73% <ø> (+0.15%)	⬆️
unit	52.68% <ø> (ø)

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