KT-5292 Expand selection should have kdoc + method as a stop point

KT-3947 Extend selection works badly with comment

 #KT-5292 Fixed
 #KT-3947 Fixed

idea/testData/wordSelection/Statements/8.kt

@@ -18,7 +18,7 @@ fun foo() : Unit {
         pr<caret>intln()
         println()
     }
-
+</selection>
     println(array(1, 2, 3))
     println()
-</selection>}
+}