Update ftplib.all_errors documentation to match code (GH-15026)


The documentation doesn't mention the `EOFError` that https://github.com/python/cpython/blob/master/Lib/ftplib.pyGH-L66 includes
(cherry picked from commit 51adfc6ed2c6c466dda84edc11d9b2b8ae2903e8)

Co-authored-by: Andrew Scheller <github@loowis.durge.org>
diff --git a/Doc/library/ftplib.rst b/Doc/library/ftplib.rst
index e006d01..7423413 100644
--- a/Doc/library/ftplib.rst
+++ b/Doc/library/ftplib.rst
@@ -144,7 +144,7 @@
    The set of all exceptions (as a tuple) that methods of :class:`FTP`
    instances may raise as a result of problems with the FTP connection (as
    opposed to programming errors made by the caller).  This set includes the
-   four exceptions listed above as well as :exc:`OSError`.
+   four exceptions listed above as well as :exc:`OSError` and :exc:`EOFError`.
 
 
 .. seealso::