chore: reverse sync java sdk with generator

[SoulPancake]

Description

Mostly some whitespace changes and ToC reordering to sync with the generator
SDK generator PR here : openfga/sdk-generator#706

What problem is being solved?

How is it being solved?

What changes are made to solve it?

References

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

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 77261cf7-b82b-43e5-aeb2-6f6bbf9205a9

📥 Commits

Reviewing files that changed from the base of the PR and between d186a7a and de9da9e.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/reverse-sync-with-generator

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[Copilot]

Pull request overview

Syncs the generated Java SDK README formatting with the upstream SDK generator output, primarily through whitespace normalization and table-of-contents restructuring.

Changes:

• Re-indented and reordered the README Table of Contents to match generator output.
• Normalized markdown whitespace (removed trailing spaces, adjusted blank lines and list indentation).

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.47%. Comparing base (d186a7a) to head (de9da9e).

❌ Your project status has failed because the head coverage (38.47%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #348   +/-   ##
=========================================
  Coverage     38.47%   38.47%           
  Complexity     1267     1267           
=========================================
  Files           198      198           
  Lines          7704     7704           
  Branches        900      900           
=========================================
  Hits           2964     2964           
  Misses         4591     4591           
  Partials        149      149           

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