NGF: Update Gateway Compatibility Document

[salonichf5]

Proposed changes

Updates Gateway Compatibility document to reflect new architecture changes.

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Closes #ISSUE

Gateway Compatibility Updates for 2.0

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• If applicable, I have added tests that prove my fix is effective or that my feature works
• I have ensured that existing tests pass after adding my changes
• If applicable, I have updated README.md and CHANGELOG.md

Footnotes

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