Update references to docker.io

Also includes markdown formatting updates

Author: md5

Dockerfile

@@ -262,7 +262,7 @@ RUN cp -v $ROOTFS/etc/version /tmp/iso/version
 
 # Get the Docker version that matches our boot2docker version
 # Note: `docker version` returns non-true when there is no server to ask
-RUN curl -L -o $ROOTFS/usr/local/bin/docker https://get.docker.io/builds/Linux/x86_64/docker-$(cat $ROOTFS/etc/version) && \
+RUN curl -L -o $ROOTFS/usr/local/bin/docker https://get.docker.com/builds/Linux/x86_64/docker-$(cat $ROOTFS/etc/version) && \
     chmod +x $ROOTFS/usr/local/bin/docker && \
     { $ROOTFS/usr/local/bin/docker version || true; }
 

doc/BUILD.md

@@ -12,29 +12,29 @@ Running the resultant image will cat the iso file to STDOUT.
 
 So the full build process goes like this:
 
-```
+```console
 # you will need more than 2GB memory
 $ docker build -t boot2docker . && docker run --rm boot2docker > boot2docker.iso
 ```
 
 Now you can install the iso to a USB drive, SD card, CD-Rom or hard-disk. The image contains
 a Master Boot Record, and a partition table, so can be written to a raw device.
 
-```
-    sudo dd if=boot2docker.iso of=/dev/sdX
+```console
+$ sudo dd if=boot2docker.iso of=/dev/sdX
 ```
 
 Making your own customised boot2docker ISO
 ==========================================
 
-The boot2docker.iso release process takes advantage of
-[docker.io Trusted Builds](https://index.docker.io/u/boot2docker/) so
-rather than modifying the Dockerfile and re-building from scratch,
-you can make a new ``Dockerfile`` that builds ``FROM boot2docker/boot2docker-rootfs``
-and then run that to generate your boot2docker.iso file:
+The `boot2docker.iso` release process takes advantage of Docker Hub's
+[Automated Builds](https://index.docker.io/u/boot2docker/) so
+rather than modifying the `Dockerfile` and re-building from scratch,
+you can make a new ``Dockerfile`` that builds ``FROM boot2docker/boot2docker``
+and then run that to generate your `boot2docker.iso` file:
 
 
-```
+```console
 $ sudo docker pull boot2docker/boot2docker
 $ echo "FROM boot2docker/boot2docker" > Dockerfile
 $ echo "ADD . $ROOTFS/data/" >> Dockerfile