[Security] Updates to Alerts summmary UI (#2562)

Contributes to #2328 by
updating the Alerts summary UI screenshot and text.

Previews:
* [Visualize detection
alerts](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2562/solutions/security/detect-and-alert/visualize-detection-alerts)
* [Manage detection
alerts](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2562/solutions/security/detect-and-alert/manage-detection-alerts)

Author: natasha-moore-elastic

solutions/images/security-alert-page-visualizations.png

@@ -15,8 +15,8 @@ products:
 
 Visualize and group detection alerts by specific parameters in the visualization section of the Alerts page.
 
-:::{image} /solutions/images/security-alert-page-visualizations.png
-:alt: Alerts page with visualizations section highlighted
+:::{image} /solutions/images/security-alert-page.png
+:alt: Alerts page with visualizations section
 :screenshot:
 :::
 
@@ -55,7 +55,7 @@ On the Alerts page, the summary visualization displays by default and shows how
 * **Alerts by name**: How many alerts each detection rule created.
 * **Top alerts by**: Percentage of alerts with a specified field value: `host.name` (default), `user.name`, `source.ip`, or `destination.ip`.
 
-You can hover and click on elements within the summary — such as severity levels, rule names, and host names — to add filters with those values to the Alerts page.
+You can interact with elements within the summary—such as severity levels, rule names, and host names—to add filters with those values to the Alerts page.
 
 :::{image} /solutions/images/security-alerts-viz-summary.png
 :alt: Summary visualization for alerts