Another batch of small typos in several classes.

-- 
Serge Stinckwich                                         -< ) 
Université de Caen>CNRS UMR 6072>GREYC>MAD                /~\ 
http://purl.org/net/SergeStinckwich                      (/  |
Smalltalkers do: [:it | All with: Class, (And love: it)] _|_/ 
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