Replace appendln with appendLine in project

idea/tests/org/jetbrains/kotlin/idea/index/AbstractKotlinTypeAliasByExpansionShortNameIndexTest.kt

@@ -51,12 +51,12 @@ abstract class AbstractKotlinTypeAliasByExpansionShortNameIndexTest : KotlinLigh
         val result = index.get(key, project, scope)
         if (value !in result.map { it.name }) {
             Assert.fail(buildString {
-                appendln("Record $record not found in index")
-                appendln("Index contents:")
+                appendLine("Record $record not found in index")
+                appendLine("Index contents:")
                 index.getAllKeys(project).asSequence().forEach {
-                    appendln("KEY: $it")
+                    appendLine("KEY: $it")
                     index.get(it, project, scope).forEach {
-                        appendln("    ${it.name}")
+                        appendLine("    ${it.name}")
                     }
                 }
             })

idea/tests/org/jetbrains/kotlin/idea/perf/UltraLightChecker.kt

@@ -251,7 +251,7 @@ object UltraLightChecker {
         val initializingClass = initializingClass ?: return name
 
         return buildString {
-            appendln("$name {")
+            appendLine("$name {")
             append(initializingClass.renderMembers())
             append("}")
         }
@@ -272,7 +272,7 @@ object UltraLightChecker {
             append(typeParameters.renderTypeParams())
             append(extendsList.renderRefList("extends"))
             append(implementsList.renderRefList("implements"))
-            appendln(" {")
+            appendLine(" {")
 
             if (isEnum) {
                 append(