[CentOS-docs] becoming root

[Ned Slider]

Alan Bartlett wrote:
> 
> 
> I seem to recall Ralph writing:
> 
>> Please mention the bash manual page (and the section about login
>> shells), where this behaviour is explained in more detail.
> 
> Apart from that, it seems to be looking good.
> 
> Alan.
> 

I kind of did here (end of su section):

"For a more detailed explanation, see the bash manual page (man bash), 
particularly the section on INVOCATION and login shells."

If you think it needs more, or a better explanation, feel free :)

I'm sure there's other stuff too that people suggested that has been 
forgotten/missed :)