don't parse lines starting with @ as KDoc tags if they're inside a Markdown code fence

#KT-11789 Fixed

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -117,6 +117,7 @@ import org.jetbrains.kotlin.js.test.semantics.*
 import org.jetbrains.kotlin.jvm.compiler.*
 import org.jetbrains.kotlin.jvm.runtime.AbstractJvm8RuntimeDescriptorLoaderTest
 import org.jetbrains.kotlin.jvm.runtime.AbstractJvmRuntimeDescriptorLoaderTest
+import org.jetbrains.kotlin.kdoc.AbstractKDocLexerTest
 import org.jetbrains.kotlin.lang.resolve.android.test.AbstractAndroidBoxTest
 import org.jetbrains.kotlin.lang.resolve.android.test.AbstractAndroidBytecodeShapeTest
 import org.jetbrains.kotlin.lang.resolve.android.test.AbstractAndroidSyntheticPropertyDescriptorTest
@@ -336,6 +337,10 @@ fun main(args: Array<String>) {
         testClass<AbstractLocalClassProtoTest>() {
             model("serialization/local")
         }
+
+        testClass<AbstractKDocLexerTest> {
+            model("kdoc/lexer")
+        }
     }
 
     testGroup("compiler/tests-java8/tests", "compiler/testData") {