[bt-spec] Index out-of-date (MINOR)

[Mark Little <mark_little@hp.com>]

I'm still looking at the 0.9.1 spec., so apologies of this has already been
fixed. However, REDIRECT doesn't appear in the index with the other
messages. Not sure if this is the only message that is missing.

Mark.

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Dr. Mark Little (mark_little@hp.com)
Transactions Architect, HP Arjuna Labs
Phone +44 191 2606216
Fax   +44 191 2606250