Update docs for ASP009

Author: JohanLarsson

documentation/ASP009.md

@@ -32,11 +32,25 @@ Use kebab-cased urls.
 
 ## Motivation
 
-ADD MOTIVATION HERE
+```cs
+[HttpGet(""api/TwoWords"")]
+public IActionResult GetId()
+{
+    ...
+}
+```
 
 ## How to fix violations
 
-ADD HOW TO FIX VIOLATIONS HERE
+```cs
+[HttpGet(""api/two-words"")]
+public IActionResult GetId()
+{
+    ...
+}
+```
+
+Use kebab-cased urls.
 
 <!-- start generated config severity -->
 ## Configure severity