Removed reference to deprecated classic/default themes.

config/vufind/searches.ini

@@ -216,11 +216,9 @@ CallNumber = callnumber
 ;       limits source to LCNAF.  Filtering is optional.
 ; PubDateVisAjax:[zooming]:[facet field 1]:[facet field 2]:...:[facet field n]
 ;       Display a visualization of publication dates for each of the specified facet
-;       fields.  This is designed for a field containing four-digit years.  Only the
-;       blueprint theme supports multiple facet field selection, but classic and
-;       default work correctly if you render just one field (the most common
-;       scenario). Zooming is set to either true or false and controls whether or
-;       not selecting part of the graph zooms in to greater detail.
+;       fields.  This is designed for a field containing four-digit years.  Zooming
+;       is set to either true or false and controls whether or not selecting part of
+;       the graph zooms in to greater detail.
 ; ResultGoogleMapAjax:[facets]
 ;       Show a Google Map with markers for all result items which have long/latitude
 ;       data (be sure to turn on location indexing in import/marc_local.properties).