[ZODB-Dev] ZODB programming guide typos

[John Belmonte]

Hello,

 From http://zope.org/Wikis/ZODB/guide/node6.html, section 5.3:

     "Each of the modules also defines some functions that operate on 
BTrees - difference(), union(), and difference(). The difference() 
function returns a bucket, while the other two methods return a set. If 
the keys are integers, then the module also defines multiunion(). If the 
values are integers, then the module also defines weightedIntersection() 
and weighterUnion(). The function doc strings describe each function 
briefly."

The typos are that "difference(), union(), and difference()" should be 
"difference(), union(), and intersection()"; and "weighterUnion()" 
should be "weightedUnion()".



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