Merge with 3.4
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 409f6c4..3c38b95 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -703,10 +703,10 @@
Return true if the *object* argument is an instance of the *classinfo*
argument, or of a (direct, indirect or :term:`virtual <abstract base
class>`) subclass thereof. If *object* is not
- an object of the given type, the function always returns false. If
- *classinfo* is not a class (type object), it may be a tuple of type objects,
- or may recursively contain other such tuples (other sequence types are not
- accepted). If *classinfo* is not a type or tuple of types and such tuples,
+ an object of the given type, the function always returns false.
+ If *classinfo* is a tuple of type objects (or recursively, other such
+ tuples), return true if *object* is an instance of any of the types.
+ If *classinfo* is not a type or tuple of types and such tuples,
a :exc:`TypeError` exception is raised.