prow.sh: comment clarification
# limitations under the License.
-# This script runs inside a Prow job. It runs unit tests ("make test")
+# This script runs inside a Prow job. It can run unit tests ("make test")
# and E2E testing. This E2E testing covers different scenarios (see
# https://github.com/kubernetes/enhancements/pull/807):
# - running the stable hostpath example against a Kubernetes release
