[R-390] Updated R-390x Newbie Support document

[Larry H]

Hi all,  I just added a 'contents' and info about the Navy field change 5
to the subject document on our r-390a.net website.  Here's a direct link: R390
Newbie Support Info.pdf (r-390a.net)
<https://www.r-390a.net/R390%20Newbie%20Support%20Info.pdf>

Regards, Larry