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Update contributing docs to point to extensions (#10537)

This PR updates the contributing docs to remove an outdated section
about extension support and instead point to the extension authoring
docs.

Release Notes:

- N/A
M
Marshall Bowers committed
97c5cffbe3264c7a48d1204bcc71a48630eebd48
Parent: 556ecd9
Committed by GitHub <noreply@github.com> on 4/14/2024, 11:31:19 PM