Update zipkin dashboard images and tracing description (#7910)

* Update zipkin dashboard images

* Fix lint

* Remove words from .spelling

Co-authored-by: Frank Budinsky <frankb@ca.ibm.com>

* crop zipkin list img and update list description

Co-authored-by: Frank Budinsky <frankb@ca.ibm.com>

content/en/docs/tasks/observability/distributed-tracing/zipkin/index.md

@@ -41,13 +41,12 @@ $ istioctl dashboard zipkin
 
     {{< boilerplate trace-generation >}}
 
-1.  From the top panel, select a service of interest (or 'all') from the **Service Name** drop-down list and click
+1.  From the search panel, click on the plus sign. Select `serviceName` from the first drop-down list, `productpage.default` from second drop-down, and then click the search icon:
-    **Find Traces**:
 
     {{< image link="./istio-tracing-list-zipkin.png" caption="Tracing Dashboard" >}}
 
-1.  Click on the most recent trace at the top to see the details corresponding to the
+1.  Click on the `ISTIO-INGRESSGATEWAY` search result to see the details corresponding to the
-    latest request to the `/productpage`:
+    latest request to `/productpage`:
 
     {{< image link="./istio-tracing-details-zipkin.png" caption="Detailed Trace View" >}}