Enable Javadoc-related Checkstyle checks (#5968)

core/src/main/java/hudson/FilePath.java

@@ -1674,8 +1674,8 @@ public final class FilePath implements SerializableOnlyOverRemoting {
 
     /**
      * Deletes this file.
-     * @throws IOException if it exists but could not be successfully deleted
      * @return true, for a modicum of compatibility
+     * @throws IOException if it exists but could not be successfully deleted
      */
     public boolean delete() throws IOException, InterruptedException {
         act(new Delete());