bpo-41482: Fix error in ipaddress.IPv4Network docstring (GH-21736)

(cherry picked from commit 52f9842)

Co-authored-by: Eric L. Frederich <[email protected]>

Author: miss-islington

Lib/ipaddress.py

@@ -1416,7 +1416,7 @@ def __init__(self, address, strict=True):
             address: A string or integer representing the IP [& network].
               '192.0.2.0/24'
               '192.0.2.0/255.255.255.0'
-              '192.0.0.2/0.0.0.255'
+              '192.0.2.0/0.0.0.255'
               are all functionally the same in IPv4. Similarly,
               '192.0.2.1'
               '192.0.2.1/255.255.255.255'