docs: Fix example curl command in hello world doc

[sai-phaneesh]

Description

Small changes in the example to align with the output

Related Issues

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• (Closes/Fixes): #<issue_number>

Pre-Launch Checklist

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• This update focuses on a single feature or bug fix. (For multiple fixes, please submit separate PRs.)
• I have read and followed the Dart Style Guide and formatted the code using dart format.
• I have referenced at least one issue this PR fixes or is related to.
• I have updated/added relevant documentation (doc comments with ///), ensuring consistency with existing project documentation.
• I have added new tests to verify the changes.
• All existing and new tests pass successfully.
• I have documented any breaking changes below.

Breaking Changes

• Includes breaking changes.
• No breaking changes.

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Additional Notes

This is purely a document change for an example.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.72%. Comparing base (7054fe9) to head (9cd5bf7).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
- Coverage   92.74%   92.72%   -0.03%     
==========================================
  Files         110      110              
  Lines        4702     4702              
  Branches     2380     2380              
==========================================
- Hits         4361     4360       -1     
- Misses        341      342       +1     

Flag	Coverage Δ
relic_core	92.68% <ø> (-0.03%)	⬇️
relic_io	93.11% <ø> (ø)

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