2021-08 as default (Azure#17419)

Author: solankisamir

specification/apimanagement/resource-manager/readme.az.md

@@ -3,7 +3,7 @@
 These settings apply only when `--az` is specified on the command line.
 
 ``` yaml $(az) && $(target-mode) == 'core'
-tag: package-preview-2021-01
+tag: package-2021-08
 az:
     extensions: apim
     namespace: azure.mgmt.apimanagement

specification/apimanagement/resource-manager/readme.md

@@ -28,7 +28,7 @@ These are the global settings for the ApiManagement API.
 title: ApiManagementClient
 description: ApiManagement Client
 openapi-type: arm
-tag: package-preview-2021-04
+tag: package-2021-08
 ```
 
 ``` yaml