[DOCS] Refresh screenshots in mapping anomalies (elastic#2210)

Author: lcawl

docs/en/stack/ml/anomaly-detection/images/weblogs-anomaly-explorer-vectors.jpg

@@ -26,7 +26,7 @@ If you have fields that contain valid vector layers, you can use the
 area is colored based on its document count. For example:
 
 [role="screenshot"]
-image::images/weblogs-data-visualizer-choropleth.jpg[A screenshot of a field that contains vector layer values in {data-viz}]
+image::images/weblogs-data-visualizer-choropleth.png[A screenshot of a field that contains vector layer values in {data-viz}]
 
 [discrete]
 [[mapping-anomalies-jobs]]
@@ -41,7 +41,7 @@ sample web logs data set to detect anomalous behavior in the sum of the data
 transferred (`bytes` values) for each destination country (`geo.dest` values):
 
 [role="screenshot"]
-image::images/weblogs-multimetric-wizard-vector.jpg[A screenshot of creating an {anomaly-job} using the web logs data in {kib}]
+image::images/weblogs-multimetric-wizard-vector.png[A screenshot of creating an {anomaly-job} using the web logs data in {kib}]
 
 .API example
 [%collapsible]
@@ -110,7 +110,7 @@ TIP: If you used APIs to create the jobs and {dfeeds}, you cannot see them
 in {kib} until you follow the prompts to synchronize the necessary saved objects.
 
 [role="screenshot"]
-image::images/weblogs-anomaly-explorer-vectors.jpg[A screenshot of the anomaly count by ___location in Anomaly Explorer]
+image::images/weblogs-anomaly-explorer-vectors.png[A screenshot of the anomaly count by ___location in Anomaly Explorer]
 
 The **Anomaly Explorer** contains a map, which is affected by your swim lane
 selections. It colors each ___location to reflect the number of anomalies in that