[FAB-3947] Polish up end to end documentation

Prioritize alpha2 commit when compiling images
Update codeblock for images
There were some errors and inaccurate information in
this piece.  Additionally there were some outdated
screen caps and weird formatting.  Plan to port this
to getting started, so formatting fix kills two birds.
[ci-skip]

Change-Id: I3ca8a8a7790d2292cbc72dc9b7e6feb91ce618bb
Signed-off-by: Nick Gaski <[email protected]>

Author: nickgaski