correct -fno-guess-branch-probabillity docs

[James E Wilson <wilson at specifixinc dot com>]

A customer was confused by the wording of the
-fno-guess-branch-probability documentation.  The docs say gcc by
default uses a randomized model, and has non-deterministic behaviour. 
This is not true.  If it was, then the object file comparisons which are
part of the bootstrap process would not work.

Here is an attempt to rewrite the doc entry to be more accurate.

The option and the docs were added here:
    http://gcc.gnu.org/ml/gcc-patches/2001-01/msg01275.html
    http://gcc.gnu.org/ml/gcc-patches/2001-01/msg01380.html
And my original explanation of what was going on is here:
    http://gcc.gnu.org/ml/gcc-patches/2001-01/msg01349.html

Comments anyone?  If I don't get any comments, I will go ahead and add
this in a few days.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

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