Document those so eclipse with strict docbook warnings doesn't get

cranky that they're never used.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5955 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/data/PermissionPolicy.java

@@ -35,6 +35,10 @@ public class PermissionPolicy
      * Returns null if the specified client has the specified permission, an error code explaining
      * the lack of access if they do not. {@link InvocationCodes#ACCESS_DENIED} should be returned
      * if no more specific explanation is available.
+     *
+     * @param clobj the client
+     * @param perm what permission they'd like to know if they have
+     * @param context potential context for the request, if that matters
      */
     public String checkAccess (ClientObject clobj, Permission perm, Object context)
     {