* Fix etcd installation command in kubeadm tutorial
Shells interpolate variables before running commands, so setting the
ETCD_VERSION variable must be separated from the command that
interpolates it. Otherwise an empty string will be interpolated.
The rm command isn't necessary - the output from curl is piped directly
to tar.
* Update stated default etcd version for K8s 1.10
1.10 is the most recent version of K8s and the default etcd server
version for it is 3.1.12
* Fix non-US English typo
Style guide states US English should be used
Tim Fogarty
54d6c6aa28