Update introduction to use engine instead of library

[ramakrishnap-nv]

Description

Update introduction to use engine instead of library

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[cwilkinson76]

LGTM

[ramakrishnap-nv]

/merge