Link updates

[GeoNiece]

Most of the links tied to VPC Endpoints are being redirected and will probably eventually go 404,

https://docs.aws.amazon.com/<wbr>vpc/latest/userguide/vpc-<wbr>endpoints.html

https://docs.aws.amazon.com/<wbr>vpc/latest/userguide/vpce-<wbr>gateway.html

Replace these with the updated PrivateLink URLs

https://docs.aws.amazon.com/vpc/latest/privatelink/concepts.html

https://docs.aws.amazon.com/vpc/latest/privatelink/gateway-endpoints.html