Drop spurious doctest.

[ci skip]

src/zope/container/btree.py

@@ -65,17 +65,8 @@ class BTreeContainer(Contained, Persistent):
         return OOBTree()
 
     def __contains__(self, key):
-        '''See interface IReadContainer
-
-        >>> c = BTreeContainer()
-        >>> "a" in c
-        False
-        >>> c["a"] = 1
-        >>> "a" in c
-        True
-        >>> "A" in c
-        False
-        '''
+        """See interface IReadContainer
+        """
         return key in self._SampleContainer__data
 
     @Lazy

src/zope/container/tests/test_btree.py

@@ -202,9 +202,6 @@ def test_suite():
         makeSuite(TestBTreeContainer),
         makeSuite(TestBTreeSpecials),
         makeSuite(TestBTreeEvents),
-        DocTestSuite('zope.container.btree',
-                     setUp=setUp,
-                     tearDown=tearDown),
         ))
 
 if __name__=='__main__':