Documentation for --random is incomplete

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There’s no indication of what distcc does about job distribution if I don’t 
use --random.  For example, if I have machines with unequal performance, is it 
better to avoid --random and list them in order of descending speed because 
they’ll get chosen in listed order?  I really don’t have enough information 
to know whether --random is likely to be a win for me.

Original issue reported on code.google.com by dave@boostpro.com on 23 Apr 2014 at 9:56