Adding ref to filter description

Author: jeff-allen-mongo

source/embedding-charts.txt

@@ -101,13 +101,13 @@ If an embedded chart fails to render, an error code is displayed:
        value must be an integer greater than 0.
 
    * - ``7``
-     - Filter not allowed. A ``filter`` parameter was
-       specified for a chart using anonymous embedding. Filters
-       can only be used with verified signatures.
+     - :ref:`Filter <embed-options-filter>` not allowed. A ``filter``
+       parameter was specified for a chart using anonymous embedding.
+       Filters can only be used with verified signatures.
 
    * - ``8``
-     - Filter not valid. A ``filter`` parameter contains an
-       invalid value.
+     - :ref:`Filter <embed-options-filter>` not valid. A ``filter``
+       parameter contains an invalid value.
 
 .. class:: hidden