NUTCH-2573 Suspend crawling if robots.txt fails to fetch with 5xx status

- fix javadoc error

src/java/org/apache/nutch/fetcher/FetchItemQueues.java

@@ -287,7 +287,7 @@ public synchronized int checkExceptionThreshold(String queueid,
     return 0;
   }
 
-  /** See {@link #checkExceptionThreshold(String, int, long)} */
+  /** @see #checkExceptionThreshold(String, int, long) */
   public int checkExceptionThreshold(String queueid) {
     return checkExceptionThreshold(queueid, this.maxExceptionsPerQueue, -1);
   }