[Spec tests] Remove spec info from fir tests

compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos/5.fir.kt

@@ -3,15 +3,6 @@
 // !DIAGNOSTICS: -UNUSED_EXPRESSION
 // SKIP_TXT
 
-/*
- * KOTLIN DIAGNOSTICS NOT LINKED SPEC TEST (POSITIVE)
- *
- * SECTIONS: dfa
- * NUMBER: 5
- * DESCRIPTION: Raw data flow analysis test
- * HELPERS: classes, interfaces, properties, functions
- */
-
 // TESTCASE NUMBER: 1
 fun case_1(x: Any?) {
     if (x is Number?) {