Docs: putting Data node example code above

[nh916]

Description

Moving the example code for creating Data node above the Parameter and Returns section in under the constructor

Changes

Screenshot

Tests

Known Issues

• the ordering between all the nodes I think is inconsistent because each one is in a different order
  • this would not change the overall documentation, its usefulness, but lessens its perfection
• the ordering goes against Numpy style guide ideal order, but I think it is okay because
  1. we are not currently following the ideal order anywhere else
  2. it looks nicer and has better UI/UX for the user

Notes

Checklist

• My name is on the list of contributors (CONTRIBUTORS.md) in the pull request source branch.
• I have updated the documentation to reflect my changes.

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