FIR: rename EXPRESSION_REQUIRED to EXPRESSION_EXPECTED

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -88,8 +88,8 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
-    add(FirErrors.EXPRESSION_REQUIRED) { firDiagnostic ->
-        ExpressionRequiredImpl(
+    add(FirErrors.EXPRESSION_EXPECTED) { firDiagnostic ->
+        ExpressionExpectedImpl(
             firDiagnostic as FirPsiDiagnostic<*>,
             token,
         )

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -83,8 +83,8 @@ sealed class KtFirDiagnostic<PSI: PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = IllegalUnderscore::class
     }
 
-    abstract class ExpressionRequired : KtFirDiagnostic<PsiElement>() {
-        override val diagnosticClass get() = ExpressionRequired::class
+    abstract class ExpressionExpected : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = ExpressionExpected::class
     }
 
     abstract class BreakOrContinueOutsideALoop : KtFirDiagnostic<PsiElement>() {

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -102,10 +102,10 @@ internal class IllegalUnderscoreImpl(
     override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
 }
 
-internal class ExpressionRequiredImpl(
+internal class ExpressionExpectedImpl(
     firDiagnostic: FirPsiDiagnostic<*>,
     override val token: ValidityToken,
-) : KtFirDiagnostic.ExpressionRequired(), KtAbstractFirDiagnostic<PsiElement> {
+) : KtFirDiagnostic.ExpressionExpected(), KtAbstractFirDiagnostic<PsiElement> {
     override val firDiagnostic: FirPsiDiagnostic<*> by weakRef(firDiagnostic)
 }