Fix small inconsistencies of README examples

[oscar0urselli]

I noticed that the examples of the README.md contains some small errors on how to use the library.
There are missing fields of the Config parameter when creating a client and the use of client.relationships() in place of client.data() .

Summary by CodeRabbit

• Documentation
  • Updated code examples in README to reflect current client configuration options and correct API usage patterns for relationship management operations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2224c8fa-f74e-4d94-9198-444d03891999

📥 Commits

Reviewing files that changed from the base of the PR and between e90f442 and 0ec7d12.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Updated README.md code examples to standardize client initialization options, replacing cert: undefined with cert: null, adding explicit pk: null and certChain: null fields, removing a timeout field, and changing client.relationship to client.data in one example.

Changes

README code example updates

Layer / File(s)	Summary
Client options and relationship writer update README.md	Eight code examples (Initialize Client, Tenant Management, Schema Management, Relationship Management, Permission Checks, Streaming, Access Token Interceptor, Certs) updated to use cert: null, pk: null, certChain: null; timeout field removed from basic client snippet; relationship writer changed from client.relationship to client.data.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: fixing inconsistencies in README usage examples.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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