[RFA/doco/Ada] Document special case for catchpoints on standard exceptions

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

This is the documentation part for the following change:
http://www.sourceware.org/ml/gdb-patches/2008-09/msg00591.html

The case where someone define his own exception re-using an exception
name that's already used in the language should be very rare, so I
don't really expect many people to be interested in that extra
paragraph, but since it's something GDB does...

2008-09-30  Joel Brobecker  <brobecker@adacore.com>

        * gdb.texinfo (catch) [exception]: Document how to insert
        a breakpoint on user-defined exceptions when the exception
        name is identical to one of the language-defined ones.

OK to commit?

Thanks,
-- 
Joel

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