Override/Implement: Implement JavaDoc/KDoc copying

#KT-8682 Fixed
 #KT-12735 Fixed
(cherry picked from commit f4486be)

idea/testData/codeInsight/overrideImplement/convertJavaDoc/foo/A.java

@@ -0,0 +1,10 @@
+package foo;
+
+public class A {
+    /**
+     * @return TEST
+     */
+    public int foo() {
+        return 1;
+    }
+}