Fix invalid URL

[reyhankoyun]

Issue #, if available: #250

Description of changes: Updated the invalid URL for Authentication and access control for AWS Secrets Manager doc

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.37%. Comparing base (022e891) to head (c4ef1cb).
Report is 43 commits behind head on main.

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Additional details and impacted files

@@             Coverage Diff             @@
##              main     #254      +/-   ##
===========================================
- Coverage   100.00%   99.37%   -0.63%     
===========================================
  Files            4        4              
  Lines          132      160      +28     
  Branches        30       40      +10     
===========================================
+ Hits           132      159      +27     
- Misses           0        1       +1     

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[reyhankoyun]

This PR only updates the README to fix a broken link — no code changes were made. The test failure seems unrelated and appears to be due to missing AWS credentials in the GitHub Actions environment.