Remove tech preview badge from docs about viewing alerts (#3678) (#3681)

(cherry picked from commit a67ef06)

Co-authored-by: DeDe Morton <[email protected]>

docs/en/observability/view-observability-alerts.asciidoc

@@ -1,14 +1,6 @@
 [[view-observability-alerts]]
 = View alerts
 
-experimental[]
-
-****
-Given the experimental status of this feature, you may want to disable writing to specific {observability} alert indices
-or disable and remove the Alerts page altogether.
-For more information on configuring alerts, see <<create-alerts-configure>>.
-****
-
 The Alerts page lists all the alerts that have met a condition defined by a rule you created using
 one of the Observability apps.
 
@@ -121,4 +113,4 @@ To add an alert to an existing case:
 
 . Select **Add to existing case**.
 . From the Select case pane, select the case for which to attach an alert. A confirmation message displays
-with an option to view the updated case. To view the case details, click the notification link or go to the <<create-cases,Cases>> page.
+with an option to view the updated case. To view the case details, click the notification link or go to the <<create-cases,Cases>> page.