Add DynamoDB SOS for index examples (#3261)
Add DynamoDB SOS for index examples (#3261)

* Update dynamodb_metadata.yaml

* Update dynamodb_metadata.yaml

* Update dynamodb_metadata.yaml

Co-authored-by: Irene Smith <3c788e5a878e0e3bbc421e0b7a82b2a715fadcb0@users.noreply.github.com>
awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples,awsdocs/aws-doc-sdk-examples