{AzureCXP} fixes Azure/azure-sdk-for-python#24694

Including the possible values for the enum of the runbook types

Docs Link: https://docs.microsoft.com/en-us/python/api/azure-mgmt-automation/azure.mgmt.automation.models.runbook?view=azure-python#parameters

fixes #24694

In this PR  Azure/azure-sdk-for-python#24745, we were asked to fix the REST API Specs before the changes are implemented in SDK.

specification/automation/resource-manager/Microsoft.Automation/stable/2019-06-01/runbook.json

@@ -1157,7 +1157,9 @@
             "PowerShellWorkflow",
             "PowerShell",
             "GraphPowerShellWorkflow",
-            "GraphPowerShell"
+            "GraphPowerShell",
+            "Python2",
+            "Python3"
           ],
           "x-ms-enum": {
             "name": "RunbookTypeEnum",
@@ -1305,7 +1307,9 @@
             "PowerShellWorkflow",
             "PowerShell",
             "GraphPowerShellWorkflow",
-            "GraphPowerShell"
+            "GraphPowerShell",
+            "Python2",
+            "Python3"
           ],
           "x-ms-enum": {
             "name": "RunbookTypeEnum",
@@ -1636,7 +1640,9 @@
             "PowerShellWorkflow",
             "PowerShell",
             "GraphPowerShellWorkflow",
-            "GraphPowerShell"
+            "GraphPowerShell",
+            "Python2",
+            "Python3"
           ],
           "x-ms-enum": {
             "name": "RunbookTypeEnum",