Fixed link in documentation

Configuring in SA1200 should point to configuration

Author: pkess

documentation/SA1200.md

@@ -19,7 +19,7 @@
 
 A C# using directive is placed outside of a namespace element.
 
-> :memo: The behavior of this rule can change based on the configuration of the `usingDirectivesPlacement` property in **stylecop.json**. See [Configuring.md](Configuring.md) for more information.
+> :memo: The behavior of this rule can change based on the configuration of the `usingDirectivesPlacement` property in **stylecop.json**. See [Configuration.md](Configuration.md) for more information.
 
 ## Rule description