[v9.5.x] docs: add alphaPanels feature toggle information (#71505)

docs: add alphaPanels feature toggle information (#71480)

* add feature toggle information

* fix typo

* fixed config information

(cherry picked from commit c3a0207615)

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

docs/sources/panels-visualizations/visualizations/geomap/index.md

@@ -357,6 +357,13 @@ The Route layer renders data points as a route.
 
 {{< figure src="/media/docs/grafana/geomap-route-layer-basic-9-4-0.png" max-width="1200px" caption="Geomap panel Route" >}}
 
+To enable the Route layer, set `enable_alpha` to `true` in your configuration file:
+
+```
+[panels]
+enable_alpha = true
+```
+
 ### Options
 
 - **Size** sets the route thickness. Fixed by default, or Min and Max range of selected field.
@@ -378,6 +385,13 @@ The Photos layer renders a photo at each data point.
 
 {{< figure src="/static/img/docs/geomap-panel/geomap-photos-9-3-0.png" max-width="1200px" caption="Geomap panel Photos" >}}
 
+To enable the Photos layer, set `enable_alpha` to `true` in your configuration file:
+
+```
+[panels]
+enable_alpha = true
+```
+
 ### Options
 
 - **Image Source Field** select a string field containing image data in either of the following formats