Important usability fix in itertools documentation.
diff --git a/Doc/lib/libitertools.tex b/Doc/lib/libitertools.tex
index 4f025e3..d17fc6f 100644
--- a/Doc/lib/libitertools.tex
+++ b/Doc/lib/libitertools.tex
@@ -348,15 +348,15 @@
>>> def all(pred, seq):
... "Returns True if pred(x) is True for every element in the iterable"
-... return not nth(ifilterfalse(pred, seq), 0)
+... return False not in imap(pred, seq)
>>> def some(pred, seq):
... "Returns True if pred(x) is True at least one element in the iterable"
-... return bool(nth(ifilter(pred, seq), 0))
+... return True in imap(pred, seq)
>>> def no(pred, seq):
... "Returns True if pred(x) is False for every element in the iterable"
-... return not nth(ifilter(pred, seq), 0)
+... return True not in imap(pred, seq)
>>> def padnone(seq):
... "Returns the sequence elements and then returns None indefinitely"