docs: fix typo in documentation (#12935)

Author: hanwha-jesoos

docs/en/setup/istio/README.md

@@ -56,7 +56,7 @@ service:
 
 ## Observing Istio
 
-Open Istio Dashboard in SkyWaling UI by clicking `Dashboard` -> `Istio`. You can then view charts and diagrams
+Open Istio Dashboard in SkyWalking UI by clicking `Dashboard` -> `Istio`. You can then view charts and diagrams
 generated by Istio metrics. You may also view them through `swctl` and set up alarm rules based on them.