Updated Get-AzureRmWebApp example, inputs, outputs

Updated Get-AzureRmWebApp to include a better example (old one used parameters that don't exist on the real cmdlet), added values to the inputs and outputs sections.

Author: thomasrayner

src/ResourceManager/Websites/Commands.Websites/help/Get-AzureRmWebApp.md

@@ -37,7 +37,7 @@ The **Get-AzureRmWebApp** cmdlet gets information about an Azure Web App.
 
 ### Example 1: Get a Web App from a resource group
 ```
-PS C:\>Get-AzureRmWebApp -ResourceGroupName "Default-Web-WestUS" -Name "ContosoSite" -SlotName "Slot001"
+PS C:\>Get-AzureRmWebApp -ResourceGroupName "Default-Web-WestUS" -Name "ContosoSite"
 ```
 
 This command gets the Web App named ContosoSite that belongs to the resource group Default-Web-WestUS.
@@ -124,8 +124,12 @@ This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable
 
 ## INPUTS
 
+### System.String
+
 ## OUTPUTS
 
+### Microsoft.Azure.Management.WebSites.Models.Site
+
 ## NOTES
 
 ## RELATED LINKS