docs:examples:guestbook: don't advice untagged image

Using untagged images means no version at all, this can be can cause weird problems. Right now, `redis:latest` is no longer compatible with the redis version used in the slave service of the example.

docs:examples:guestbook: don't advice untagged image
4e17e95e · O'meid · GitHub · 1bfef708 · 4e17e95e
Commit 4e17e95e authored May 04, 2017 by O'meid Committed by GitHub May 04, 2017
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--- a/examples/guestbook/README.md
+++ b/examples/guestbook/README.md
@@ -142,7 +142,7 @@ spec:
    spec:
      containers:
      - name: master
-        image: gcr.io/google_containers/redis:e2e  # or just image: redis
+        image: gcr.io/google_containers/redis:e2e
        resources:
          requests:
            cpu: 100m