[Spec tests] Link diagnostic tests for when expression with Kotlin specification

compiler/testData/diagnostics/tests/when/BranchFalseBypass.kt

@@ -1,3 +1,11 @@
+/*
+ * RELEVANT SPEC SENTENCES (spec version: 0.1-155, test type: pos):
+ *  - expressions, when-expression, exhaustive-when-expressions -> paragraph 2 -> sentence 9
+ *  - expressions, when-expression -> paragraph 6 -> sentence 1
+ *  - expressions, when-expression -> paragraph 5 -> sentence 1
+ *  - type-inference, smart-casts, smart-cast-types -> paragraph 9 -> sentence 1
+ *  - type-inference, smart-casts, smart-cast-types -> paragraph 9 -> sentence 8
+ */
 enum class My { A, B }
 
 fun test(a: My): String {
@@ -7,6 +15,6 @@ fun test(a: My): String {
         My.A -> q = "1"
         My.B -> q = "2"
     }<!>
-    // When is exhaustive
+    // When is exhaustives
     return <!DEBUG_INFO_SMARTCAST!>q<!>
 }