unify javadoc warnings: @return tag should be highlighted if description is missed (IDEA-47680)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/javaDoc/MissingReturnDescription.java

@@ -1,6 +1,6 @@
 class MissingRetunDescription {
   /**
-  * @return<EOLWarning/>
+  * <warning>@return</warning>
   * @throws Exception in some case
   */
   public boolean foo() throws Exception {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/javaDoc/Param4.java

@@ -2,7 +2,7 @@ class Test {
 
     /**
      * @param <error>i</error> here description goes
-     * @return<EOLWarning/>
+     * <warning>@return</warning>
      */
     int d(){return 1;}
 }