fix ns name in e2e tests

Signed-off-by: Denis Karpelevich <[email protected]>

Author: dkarpele

test/e2e/README.md

@@ -41,7 +41,7 @@ The end-to-end tests are comprised of the following components:
 4. Create required namespaces in the cluster: 
    * `kubectl create ns argocd-image-updater-e2e`
 
-   * `kubectl create ns image-updater-system`
+   * `kubectl create ns argocd-image-updater-system`
 
 ## Pre-requisites