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>
1 file changed