fixing links to files for metadata

[boyney123]

Fix for a few files that have broken links to files.

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[brnkrygs]

TypeScript changes look good. Though, I'm a bit thrown because from what I can see, main already has fixed links for that sample:

https://github.com/aws-samples/serverless-test-samples/blob/main/typescript-test-samples/apigw-lambda-dynamodb/metadata.json

[brnkrygs]

Closing as abandoned. Repo structure has evolved since this was opened.