[plt-scheme] typo error 11.2.2

From: mike (anesward at mac.com)
Date: Sat Mar 28 00:39:14 EDT 2009

Develop the function......Specifically it consumes
a natural number and produces a list of  n posns.
(since  0 is included in the recursion i believe it
should state "a list of n+1 posns"

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