[FAB-3925] Update Getting Started for alpha2

title should be self-explanatory
feedback incorporated
edited by CBF to address review comments

Change-Id: Ic5cbc7a504686ed72a9587d00c336420c73eacff
Signed-off-by: Nick Gaski <[email protected]>
Signed-off-by: Christopher Ferris <[email protected]>

Author: nickgaski