Add hint about how to refresh the JSON schema.

Adds a hint about how to refresh the schema if it goes out of date in Visual Studio.

Author: martincostello

documentation/Configuration.md

@@ -29,6 +29,7 @@ A JSON schema is available for **stylecop.json**. By including a reference in **
 ```
 
 > :bulb: The code fix described previously automatically configures **stylecop.json** to reference the schema.
+> If the schema appears to be out-of-date in Visual Studio, right click anywhere in the **stylecop.json** document and then select **Reload Schemas**.
 
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