Update the Alpine examples (versions and built image sizes)

alpine/content.md

@@ -11,22 +11,22 @@
 Use like you would any other base image:
 
 ```dockerfile
-FROM alpine:3.3
+FROM alpine:3.5
 RUN apk add --no-cache mysql-client
 ENTRYPOINT ["mysql"]
 ```
 
-This example has a virtual image size of only 16 MB. Compare that to our good friend Ubuntu:
+This example has a virtual image size of only 36.5MB. Compare that to our good friend Ubuntu:
 
 ```dockerfile
-FROM ubuntu:14.04
+FROM ubuntu:16.04
 RUN apt-get update \
-    && apt-get install -y mysql-client \
+    && apt-get install -y --no-install-recommends mysql-client \
     && rm -rf /var/lib/apt/lists/*
 ENTRYPOINT ["mysql"]
 ```
 
-This yields us a virtual image size of about 232 MB image.
+This yields us a virtual image size of about 184MB image.
 
 ## Documentation