chore: Change release term in getting started guide. (#450)

Author: kggilmer

README.md

@@ -10,7 +10,7 @@
 
 This repo contains the AWS SDK for Kotlin and its [public roadmap](https://github.com/awslabs/aws-sdk-kotlin/projects/2)
 
-**The AWS SDK for Kotlin is currently in alpha and is intended strictly for feedback purposes only. Do not use this SDK for production workloads. Refer to the SDK [stability](docs/stability.md) guidelines**
+**The AWS SDK for Kotlin is currently in developer preview and is intended strictly for feedback purposes only. Do not use this SDK for production workloads. Refer to the SDK [stability](docs/stability.md) guidelines**
 
 ## Getting Started
 

docs/GettingStarted.md

@@ -1,7 +1,7 @@
-# Alpha Release Quickstart
+# Beta Release Quickstart
 
-Alpha releases of the AWS SDK for Kotlin are published to Maven Central with the `-alpha` qualifier. 
-**NOTE: Alpha releases are not meant for production workloads**.
+Beta releases of the AWS SDK for Kotlin are published to Maven Central with the `-beta` qualifier. 
+**NOTE: Beta releases are not meant for production workloads**.
 Consult the [stability guide](stability.md) for more information on SDK stability and maintenance.
 
 1. Add the repository to your Gradle or Maven configuration