Fix /search curl example: wrap text in contents object

[mfine15]

Summary

Fixes the "Simple search and contents" curl example for the /search endpoint. The example was using "text": true at the top level, which is silently ignored by the API. The text parameter must be wrapped in a contents object.

Before (broken):

{"query": "...", "text": true}

After (working):

{"query": "...", "contents": {"text": true}}

The Python and JavaScript SDK examples work correctly because the SDKs handle this transformation internally.

Review & Testing Checklist for Human

• Test the curl example against the API and verify it now returns text content in results
• Confirm the contents wrapper is the correct structure per API implementation

Notes

Part of a docs audit finding behavior mismatches between documentation and actual API behavior. Other issues being addressed in separate PRs.

Link to Devin run: https://app.devin.ai/sessions/616457e78aea475481e0607e4f176b40
Requested by: Michael Fine (@mfine15), PRs requested by Ishan Goswami

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