Update docstring for `Named` constructor

[danieljharvey]

Minor clarification to docstring comment - argument to comparison operators can be scalar or object types.

• [ ] RFC
• [X] Specification updates
  • [ ] Changelog
  • [ ] Specification pages
  • [ ] Tutorial pages
  • [ ] reference/types.md
• [ ] Implement your feature in the reference connector
• [ ] Generate test cases in ndc-test if appropriate
• [ ] Does your feature add a new capability?
  • [ ] Update specification/capabilities.md in the specification
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