Update docs

uui-e2e-tests/readme.md

@@ -29,7 +29,7 @@
 3. [Optional step] Change ```./.env.local``` file in order to set non-standard UUI_APP_BASE_URL
 
 #### NPM tasks to use
-Note: If the tasks are run for the very first time, it might take some time to download necessary docker images.
+Note: If the tasks are run for the very first time, it might take some time to download necessary docker images (about 10 min).
 ```shell
 # Run tests in docker container
 yarn local-test-e2e
@@ -42,16 +42,16 @@ yarn local-test-e2e-report-show
 ```
 
 ### Useful Podman commands
+The image for UUI e2e test requires about ```2.2 Gb``` of free disk space.
+The following commands can help you to check how much disk space is being used.
 ```
-# list all images and their sizes
-podman images --all
-
-# show podman disk usage
+# Show podman disk usage
 podman system df
 
-# remove all images
-podman rmi --all --force
+# List all images and their sizes
+podman images --all
 
-# remove all stopped containers
-podman container prune --force
+# Delete all images. Usually it should not be used. 
+# When the e2e tests are run after deleting all images, all necessary dependencies will download again which will take some time.
+podman rmi --all --force
 ```