Revert "remove switch statements between api versions for compute"

This reverts commit bf1b3a2.

Author: paddycarver

docs/index.html.markdown

@@ -112,6 +112,5 @@ deprecation policy, and no SLA, but are otherwise considered to be feature-compl
 with only minor outstanding issues after their Alpha period. Beta is when a GCP feature
 is publicly announced, and is when they generally become publicly available.
 
-Terraform resources that support beta features will always use the Beta APIs to provision
-the resource. Importing a resource that supports beta features will always import those
-features, even if the resource was created in a matter that was not explicitly beta.
+Resources will automatically be provisioned using Beta APIs when you specify a feature
+marked Beta in your Terraform config file.