{AzureAutomation} fixes #19631 (#19674)

fixes #19631

The -parameters argument should be descriptive and should have an example of sample value.

Author: navba-MSFT

src/Automation/Automation/help/Register-AzAutomationScheduledRunbook.md

@@ -87,6 +87,7 @@ Specifies a hash table of key/value pairs.
 The keys are runbook parameter names.
 The values are runbook parameter values.
 When the runbook starts in response to the associated schedule, these parameters are passed to the runbook.
+Example: -Parameters @{"Key1"="Value1";"Key2"="Value2"}
 
 ```yaml
 Type: System.Collections.IDictionary