Add section on billing dashboard filters and fixes some outdated info (#644)

Author: davidhou17

source/dashboards/manage-dashboards/billing-dashboards.txt

@@ -107,6 +107,56 @@ To ingest your billing data and add a billing dashboard:
       and :ref:`interactive filtering <interact-with-charts>`, apply to
       billing dashboards and its prebuilt charts.
 
+      To learn more about filtering billing dashboards, 
+      see :ref:`billing-dashboard-filter`.
+
+.. _billing-dashboard-filter:
+
+Apply Dashboard Filters
+-----------------------
+
+You can use :ref:`dashboard filters <filter-dashboards>`
+to refine the charts across your billing dashboard.
+By default, billing dashboards include
+filters on the following fields from your billing data:
+
+- ``name``
+- ``cluster``
+- ``category``
+- ``sku`` 
+
+To view active filters, click the filter icon 
+in the top-right corner of your dashboard to expand 
+the :guilabel:`Dashboard Filters` pane. 
+
+In the :guilabel:`Dashboard Filters` pane, 
+you can manage your active filters
+or click :guilabel:`Edit` to add and apply 
+new filters. When you apply a filter, the 
+charts in your dashboard update to display only data 
+that matches the field values that you filtered on.
+
+To learn more, see :ref:`dashboard-filters-pane`.
+
+Example
+~~~~~~~
+
+Consider a sample billing dashboard that uses the following filters:
+
+- A filter on the ``category`` field to include only invoices 
+  related to the |charts-short| and Private Endpoint categories.
+
+- A filter on the ``date`` field to include only invoices incurred 
+  within the past 6 months.
+
+Once the filters are applied, the charts in the billing dashboard 
+highlight only the values specified in these filters. For example:
+
+.. figure:: /images/charts/billing-dashboard-filter-example.png
+   :figwidth: 750px
+   :alt: A sample Billing Dashboard with filters on the category 
+         and date fields.
+
 Manage |service| Billing Ingestions
 -----------------------------------
 

source/dashboards/view-dashboard-data/dashboard-filtering.txt

@@ -94,6 +94,8 @@ unless you :ref:`reset a filter <revert-dashboard-filters>`.
    initial default filter values after refreshing the page or starting 
    a new session.
 
+.. _dashboard-filters-pane:
+
 The :guilabel:`Dashboard Filters` Pane
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -120,23 +122,21 @@ Fiction and History movies released in or after 1968. Dashboard
 ``Viewers`` can provide their own values for the filterable fields to 
 refine chart data based on their interests.
 
-.. figure:: /images/charts/edit-dashboard-filters.png
-   :figwidth: 720px
-   :alt: An image of a dashboard. The :guilabel:`Edit Dashboard Filters`
-         pane is highlighted. 
+.. figure:: /images/charts/sample-dashboard-filters.png
+   :figwidth: 300px
+   :alt: Sample dashboard filters on the genre and year fields.
 
 To learn about filtering options for each field data type, see 
 :ref:`filter-tab`.
 
 Expand or Collapse Dashboard Filters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-You can expand or collapse dashboard filter cards by clicking 
-:guilabel:`Show` or :guilabel:`Hide` on that card.
+You can expand or collapse dashboard filter cards.
 
 Disabled filters are automatically collapsed.
 
-Enabled, collapsed filters are still applied to your charts.
+When enabled, collapsed filters still apply to your charts.
 
 .. _manage-dashboard-filters:
 
@@ -176,7 +176,7 @@ To add a dashboard filter:
 
 1. Expand the :guilabel:`Dashboard Filters` pane on the desired 
    dashboard.
-#. If a dashboard has no filers, click :guilabel:`Add Filters`. 
+#. If a dashboard has no filters, click :guilabel:`Add Filters`. 
    Otherwise, click :guilabel:`Edit`.
 #. Expand a data source that contains fields you want to add a filter 
    for.
@@ -249,6 +249,11 @@ After you create a dashboard filter, you can:
 - Stack fields from other data sources.
 - Change the default field values.
 
+.. figure:: /images/charts/edit-dashboard-filters.png
+   :figwidth: 720px
+   :alt: An image of a dashboard. The :guilabel:`Edit Dashboard Filters`
+         pane is highlighted. 
+
 To edit a dashboard filter:
 
 1. Expand the :guilabel:`Dashboard Filters` pane on the desired