(DOCSP-18415) Charts display filter icon when affected by dashboard filters (#502)

* (DOCSP-18415) Charts display filter icon when affected by dashboard filters

Author: zach-carr

source/dashboard-filtering.txt

@@ -37,9 +37,13 @@ default filter values.
 
 .. figure:: /images/charts/dashboard-filter-cards.png
    :figwidth: 720px
-   :alt: An image of a dashboard. Two filter cards are highlighted. The
-         charts only display data that corresponds to the selected field
-         values.
+   :alt: An image of a dashboard. The :guilabel:`Dashboard Filters`
+         pane is highlighted. 
+
+If one or more dashboard filters are applied to a chart, a 
+:icon-fa5:`filter` icon displays in the bottom left corner of that 
+chart. Hover over the :icon-fa5:`filter` icon for a list of the 
+filtered fields on that chart.
 
 .. note::
 
@@ -94,7 +98,7 @@ pane.
 .. figure:: /images/charts/expand-filter-pane.png
    :figwidth: 720px
    :alt: An image of a dashboard. The :guilabel:`Dashboard Filters` icon
-         is highlighted.
+         in the top right corner is highlighted.
 
 The :guilabel:`Dashboard Filters` pane displays a filter card for 
 each field you can use to filter chart data. You can configure filter