docs/library/io: Remove io.FileIO and io.TextIOWrapper.

FileIO and TextIOWrapper were removed in
e65d1e69e8.  Remove them also from the
documentation.

Signed-off-by: Thomas Ackermann <th.acker@arcor.de>

docs/library/io.rst

@@ -86,16 +86,6 @@ Functions
 Classes
 -------
 
-.. class:: FileIO(...)
-
-    This is type of a file open in binary mode, e.g. using ``open(name, "rb")``.
-    You should not instantiate this class directly.
-
-.. class:: TextIOWrapper(...)
-
-    This is type of a file open in text mode, e.g. using ``open(name, "rt")``.
-    You should not instantiate this class directly.
-
 .. class:: StringIO([string])
 .. class:: BytesIO([string])