Docs: Fix broken redirect in usage-reporting.md

[nginx-aoife]

Proposed changes

Problem: The link to the NIM product page in the Usage Reporting guide is a broken redirect. User gets a 404.

Solution: Updating the link to point to the actual F5 NIM product page

Testing: n/a

Please also Merge if approved

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.62%. Comparing base (4aa68d7) to head (139e456).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2616   +/-   ##
=======================================
  Coverage   88.62%   88.62%           
=======================================
  Files         105      105           
  Lines        8109     8109           
  Branches       50       50           
=======================================
  Hits         7187     7187           
  Misses        865      865           
  Partials       57       57           

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