Broker guide installation instructions

In installing the Broker on my (Linux) machine, I noted the following two issues with the installation instructions:

*In 2.3. Installing on Linux section: starting with step 3, the zip file name listed in the command is wrong; it's not jboss-amq7.y.z.zip, but rather amq-broker-7.y.z-bin.zip

*Minor nit: In the Downloading an AMQ Broker Archive section: The first step should take the user directly here: https://access.redhat.com/downloads/ (combine steps 1 and 2)