docs(README): fix list relations code

[smv1256]

Description

ListRelationsRequest should be ClientListRelationsRequest.

References

#67

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

If you haven't done so yet, we would appreciate it if you could star the OpenFGA repository. :)

[linux-foundation-easycla]

• ✅login: smv1256 / (b5150e7)

The committers listed above are authorized under a signed CLA.

[ewanharris]

Thanks for the PR @smv1256!

Could you please sign the CLA so we're able to merge this PR.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.01%. Comparing base (8144f26) to head (b5150e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   33.01%   33.01%           
=======================================
  Files         128      128           
  Lines        6388     6388           
  Branches      840      840           
=======================================
  Hits         2109     2109           
  Misses       4099     4099           
  Partials      180      180           

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