resolved some issues with transform iterator

[SVN r21638]

doc/transform_iterator_abstract.rst

@@ -1,5 +1,3 @@
-The transform iterator adapts an iterator by applying some function
-object to the result of dereferencing the iterator. In other words,
-the ``operator*`` of the transform iterator first dereferences the
-base iterator, passes the result of this to the function object, and
-then returns the result.
+The transform iterator adapts an iterator by modifying the
+``operator*`` to apply a function object to the result of
+dereferencing the iterator and returning the result.