small fix suggested by intellij
diff --git a/jspwiki-main/src/main/java/org/apache/wiki/LinkCollector.java b/jspwiki-main/src/main/java/org/apache/wiki/LinkCollector.java
index 1a83d07..1800b0d 100644
--- a/jspwiki-main/src/main/java/org/apache/wiki/LinkCollector.java
+++ b/jspwiki-main/src/main/java/org/apache/wiki/LinkCollector.java
@@ -40,7 +40,7 @@
     /**
      * {@inheritDoc}
      */
-    public String mutate( WikiContext context, String in ) {
+    public String mutate( final WikiContext context, final String in ) {
         m_items.add( in );
         return in;
     }