Errata: Missing token explenation (ch.5, pg.168)

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At the end of page 168, the last paragraph describes the tokens used in the 
following table (5.6). The tokens mentioned are 'gentype' and 'ugentype'. 
However, the table makes use of 'sgentype', which is a signed type. It seems 
fitting that this would be mentioned as well.

Note: this token does get explained prior to other tables in the following 
pages.

Original issue reported on code.google.com by [email protected] on 8 Aug 2011 at 5:52