chore(doc): fix broken link for RFC in contributing guide #30955
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Issue # (if applicable)
Closes #NA.
Reason for this change
Current link is broken in the contributing guide and gives 404.
Description of changes
Fix broken link to point to correct AWS RFC repo.
Description of how you validated changes
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license