Remove comments from function/property implementation template

#KT-18539 Fixed

idea/testData/codeInsight/overrideImplement/privateJavaMethod/foo/Impl.kt.after

@@ -20,6 +20,6 @@ class C : A(), I {
     }
 
     override fun z() {
-        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+        TODO("Not yet implemented")
     }
 }