docs(codepipeline-actions): update CodeStarConnectionsSourceActionPro…

…ps docs to also mention GitHub (aws#14155)

Expanded `CodeStarConnectionsSourceActionProps` doc comment to include GitHub repositories in addition to BitBucket repositories.

Fixes aws#14142

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-codepipeline-actions/lib/codestar-connections/source-action.ts

@@ -20,7 +20,7 @@ export interface CodeStarConnectionsSourceActionProps extends codepipeline.Commo
 
   /**
    * The ARN of the CodeStar Connection created in the AWS console
-   * that has permissions to access this BitBucket repository.
+   * that has permissions to access this GitHub or BitBucket repository.
    *
    * @example 'arn:aws:codestar-connections:us-east-1:123456789012:connection/12345678-abcd-12ab-34cdef5678gh'
    * @see https://docs.aws.amazon.com/codepipeline/latest/userguide/connections-create.html