[FIR] Fix TEST SPEC tests

Ensure the test data contents for both the frontends
are identical. This is needed for proper analysis of
K2-differences.

compiler/tests-spec/testData/diagnostics/linked/statements/loop-statements/while-loop-statement/p-3/neg/1.1.fir.kt

@@ -1,6 +1,17 @@
 // !DIAGNOSTICS: -UNUSED_VARIABLE -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -UNUSED_VALUE -UNUSED_PARAMETER -UNUSED_EXPRESSION
 // SKIP_TXT
 
+/*
+ * KOTLIN DIAGNOSTICS SPEC TEST (NEGATIVE)
+ *
+ * SPEC VERSION: 0.1-253
+ * MAIN LINK: statements, loop-statements, while-loop-statement -> paragraph 3 -> sentence 1
+ * PRIMARY LINKS: statements, loop-statements, while-loop-statement -> paragraph 1 -> sentence 1
+ * NUMBER: 1
+ * DESCRIPTION: condition expression is not a subtype of kotlin.Boolean.
+ * HELPERS: checkType
+ */
+
 // FILE: KotlinClass.kt
 // TESTCASE NUMBER: 1
 fun case1() {