Fix javadoc warning in GitilesAccess

Change-Id: I0cb240ffb9314d2a42681cb5999020cc43eeb19c

gitiles-servlet/src/main/java/com/google/gitiles/GitilesAccess.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/GitilesAccess.java b/gitiles-servlet/src/main/java/com/google/gitiles/GitilesAccess.java
index 978baa3..4572033 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/GitilesAccess.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/GitilesAccess.java
@@ -52,8 +52,8 @@
 
   /**
    * @return an opaque object that uniquely identifies the end-user making the
-   *     request, and supports {@link #equals(Object)} and {@link #hashCode()}.
-   *     Never null.
+   *     request, and supports {@link Object#equals(Object)} and
+   *     {@link Object#hashCode()}. Never null.
    */
   public Object getUserKey();