docs/provisioner/powershell: Add documentation for `skip_clean` option

provisioner/powershell/provisioner.go

@@ -53,7 +53,10 @@ type Config struct {
 	ElevatedExecuteCommand string `mapstructure:"elevated_execute_command"`
 
 	// Whether to clean scripts up after executing the provisioner.
-	// Defaults to false.
+	// Defaults to false. When true any script created by a non-elevated Powershell
+	// provisioner will be removed from the remote machine. Elevated scripts,
+	// along with the scheduled tasks, will always be removed regardless of the
+	// value set for `skip_clean`.
 	SkipClean bool `mapstructure:"skip_clean"`
 
 	// The timeout for retrying to start the process. Until this timeout is

website/pages/docs/provisioners/powershell.mdx

@@ -142,6 +142,12 @@ The example below is fully functional.
   script is uploaded to. The value must be a writable location and any parent
   directories must already exist.
 
+- `skip_clean` (bool) - Whether to clean scripts up after executing the provisioner.
+	Defaults to false. When true any script created by a non-elevated Powershell
+	provisioner will be removed from the remote machine. Elevated scripts,
+	along with the scheduled tasks, will always be removed regardless of the
+	value set for `skip_clean`.
+
 - `start_retry_timeout` (string) - The amount of time to attempt to _start_
   the remote process. By default this is "5m" or 5 minutes. This setting
   exists in order to deal with times when SSH may restart, such as a system