Fix link to configuration in rule documentation file

Author: mattia

Documentation/RuleDocumentation.md

@@ -4,7 +4,7 @@
 
 Use the rules below in the `rules` block of your `.swift-format`
 configuration file, as described in
-[Configuration](Documentation/Configuration.md). All of these rules can be
+[Configuration](Configuration.md). All of these rules can be
 applied in the linter, but only some of them can format your source code
 automatically.