[RFA/doco] set/unset/show substitute-path documentation

[Joel Brobecker <brobecker at adacore dot com>]

Hello Eli,

The syntax and semantics of the substitute-path commands have been
changed, so the documentation needed to be rewritten.  The difference
now is that these commands manipulate a LIST of rules instead of just
one. We also introduced a new limitation to avoid unexpected
substitutions from happening: The rule is anchored at the begining
of the source path, and the end should be at a directory separator.

Hopefully, I captured that as clearly as possible in the new update.
Let me know what you think.

2006-06-27  Joel Brobecker  <brobecker@adacore.com>

        * gdb.texinfo (Source Path): Add documentation for new
        substitute-path commands.

Thanks,
-- 
Joel

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