Display description of language version in options

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinCommonOptions.kt

@@ -6,14 +6,14 @@ interface KotlinCommonOptions {
 
     /**
      * Allow to use declarations only from the specified version of bundled libraries
-     * Possible values: "1.0", "1.1", "1.2"
+     * Possible values: "1.0", "1.1", "1.2 (EXPERIMENTAL)"
      * Default value: "1.1"
      */
      var apiVersion: kotlin.String
 
     /**
      * Provide source compatibility with specified language version
-     * Possible values: "1.0", "1.1", "1.2"
+     * Possible values: "1.0", "1.1", "1.2 (EXPERIMENTAL)"
      * Default value: "1.1"
      */
      var languageVersion: kotlin.String

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinJsOptions.kt

@@ -54,4 +54,4 @@ interface KotlinJsOptions  : org.jetbrains.kotlin.gradle.dsl.KotlinCommonOptions
      * Default value: false
      */
      var typedArrays: kotlin.Boolean
-}
+}

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinJsOptionsBase.kt

@@ -93,4 +93,4 @@ internal fun org.jetbrains.kotlin.cli.common.arguments.K2JSCompilerArguments.fil
     sourceMap = false
     target = "v5"
     typedArrays = false
-}
+}