added dates to Sumerian deprecation (#5089)

* added dates to Sumerian deprecation

* update error message wording

* updated wording

* updated wording

* updated and removed linting

* reverted linting

* removed Sumerian from the Auth overview page

* Update src/fragments/lib/xr/sceneapi.mdx

Co-authored-by: John Hockett <[email protected]>

* Update src/fragments/lib/xr/getting-started.mdx

Co-authored-by: John Hockett <[email protected]>

---------

Co-authored-by: Kamil Sobol <[email protected]>
Co-authored-by: John Hockett <[email protected]>

Author: 3 people

src/fragments/lib/auth/common/overview.mdx

@@ -15,7 +15,7 @@ Authorization is often done in one of two ways:
 1. Clients pass the tokens to the backend that perform custom logic to allow or deny actions
 1. Clients sign the requests and the backend validates the signature, allowing or denying actions depending on predefined policy. The predefined rules are known as [IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies.html) policies and automatically configured by the Amplify CLI.
 
-The first mode is a common authorization method for REST or GraphQL APIs, while the second mode is necessary for interfacing with AWS services such as S3, Pinpoint, Sumerian, and others. 
+The first mode is a common authorization method for REST or GraphQL APIs, while the second mode is necessary for interfacing with AWS services such as S3, Pinpoint, and others. 
 
 ## Sign-up and sign-in
 

src/fragments/lib/xr/getting-started.mdx

@@ -1,7 +1,6 @@
 <Callout warning>
 
-The XR category is on a deprecation path. Please see [https://github.com/aws-samples/aws-tools-for-babylonjs-editor](https://github.com/aws-samples/aws-tools-for-babylonjs-editor) for examples 
-on using AWS services with Babylon.js
+Your Sumerian scenes will no longer be available as of 2/21/2023. Consequently, the XR category will be unavailable. You can use Babylon.js, an open source 3D engine to author scenes in the future. Please see [Babylon.js sample](https://github.com/aws-samples/aws-tools-for-babylonjs-editor) for examples on using Babylon.js and publishing your scenes with Amplify Hosting.
 
 </Callout>
 

src/fragments/lib/xr/sceneapi.mdx

@@ -1,7 +1,6 @@
 <Callout warning>
 
-The XR category is on a deprecation path. Please see [https://github.com/aws-samples/aws-tools-for-babylonjs-editor](https://github.com/aws-samples/aws-tools-for-babylonjs-editor) for examples 
-on using AWS services with Babylon.js
+Your Sumerian scenes will no longer be available as of 2/21/2023. Consequently, the XR category will be unavailable. You can use Babylon.js, an open source 3D engine to author scenes in the future. Please see [Babylon.js sample](https://github.com/aws-samples/aws-tools-for-babylonjs-editor) for examples on using Babylon.js and publishing your scenes with Amplify Hosting.
 
 </Callout>