Update README.md

Author: beqqrry-aws

ruby/README.md

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 The code examples in this topic show you how to use the AWS SDK for Ruby Version 3. 
 
 The AWS SDK for Ruby Version 3 provides a Ruby API for AWS infrastructure services. Using the SDK, you can build applications on top of Amazon S3, Amazon EC2, Amazon DynamoDB, and more.
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 ## Types of code examples
 * **Single-service actions** - Code examples that show you how to call individual service functions.