[CentOS-docs] CentOSPlus kernel config differences

[cpolish at surewest.net]

Hello,

I've finally got some time to attend to documentation.
I've updated https://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus
to include details on what is the difference between a
default CentOS kernel and the Plus kernel, in a general
way, with instructions on how to get specifics, and a
current example. I hope I've correctly followed protocol.

-- 
Charles Polisher