Merge pull request #1235 from infosiftr/alpine-refresh

Update Alpine docs (links, sizes, versions, etc)

alpine/content.md

@@ -1,6 +1,6 @@
 # What is Alpine Linux?
 
-[Alpine Linux](http://alpinelinux.org/) is a Linux distribution built around [musl libc](http://www.musl-libc.org/) and [BusyBox](http://www.busybox.net/). The image is only 5 MB in size and has access to a [package repository](http://forum.alpinelinux.org/packages) that is much more complete than other BusyBox based images. This makes Alpine Linux a great image base for utilities and even production applications. [Read more about Alpine Linux here](https://www.alpinelinux.org/about/) and you can see how their mantra fits in right at home with Docker images.
+[Alpine Linux](https://alpinelinux.org/) is a Linux distribution built around [musl libc](https://www.musl-libc.org/) and [BusyBox](https://www.busybox.net/). The image is only 5 MB in size and has access to a [package repository](https://pkgs.alpinelinux.org/) that is much more complete than other BusyBox based images. This makes Alpine Linux a great image base for utilities and even production applications. [Read more about Alpine Linux here](https://alpinelinux.org/about/) and you can see how their mantra fits in right at home with Docker images.
 
 %%LOGO%%
 
@@ -11,12 +11,12 @@
 Use like you would any other base image:
 
 ```dockerfile
-FROM %%IMAGE%%:3.5
+FROM %%IMAGE%%:3.7
 RUN apk add --no-cache mysql-client
 ENTRYPOINT ["mysql"]
 ```
 
-This example has a virtual image size of only 36.5MB. Compare that to our good friend Ubuntu:
+This example has a virtual image size of only 36.8MB. Compare that to our good friend Ubuntu:
 
 ```dockerfile
 FROM ubuntu:16.04
@@ -26,7 +26,7 @@ RUN apt-get update \
 ENTRYPOINT ["mysql"]
 ```
 
-This yields us a virtual image size of about 184MB image.
+This yields us a virtual image size of about 179MB image.
 
 ## Documentation