[rtems-docs]Ticket #2562 solved , Release version guidelines added (GCI 2018)

[Shashvat Jain]

Hello ,
this is the updated patch with proper title and discription
A new paragraph has been added In the quick start for assisting new users
to build the correct and updated version. Command outputs to the example
have also been trimmed and added .
If everything looks good please commit it ,or inform me about the change to
be made .

Thank you
Regards

--Shashvat
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