Fixed spelling errors.

utilities/README.txt

-This directory contains ustility scripts and modules that augment Zope.
+This directory contains utility scripts and modules that augment Zope.
 
 To get detailed usage information, run any of these scripts without arguments:
 
   bbb.py -- Read and summarize a Zope database.
  
-    This script illstrates how to read a database file outside of
+    This script illustrates how to read a database file outside of
     Zope and provides a number of options for finding bad data and 
     generating reports of data.