[Spec tests] Remove spec info from fir tests

compiler/tests-spec/testData/diagnostics/linked/expressions/additive-expression/p-4/pos/1.1.fir.kt

@@ -2,18 +2,6 @@
 // !DIAGNOSTICS: -UNUSED_VARIABLE -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -UNUSED_VALUE -UNUSED_PARAMETER -UNUSED_EXPRESSION
 // SKIP_TXT
 
-/*
- * KOTLIN DIAGNOSTICS SPEC TEST (POSITIVE)
- *
- * SPEC VERSION: 0.1-218
- * MAIN LINK: expressions, additive-expression -> paragraph 4 -> sentence 1
- * PRIMARY LINKS: expressions, additive-expression -> paragraph 4 -> sentence 2
- * overloadable-operators -> paragraph 4 -> sentence 1
- * NUMBER: 1
- * DESCRIPTION: The return type of these functions is not restricted.
- * HELPERS: checkType
- */
-
 // TESTCASE NUMBER: 1
 class Case1(var a: Int) {
     operator fun minus(o: Int): Case1 { TODO() }