bpo-17305: Link to the third-party idna package. (GH-25208)

bpo-17305: Link to the third-party idna package. (GH-25208) · python/cpython@1d023e3

Original file line number	Diff line number	Diff line change
@@ -1417,6 +1417,9 @@ Applications) and :rfc:`3492` (Nameprep: A Stringprep Profile for
`1417`	`1417`	Internationalized Domain Names (IDN)). It builds upon the ``punycode`` encoding
`1418`	`1418`	and :mod:`stringprep`.
`1419`	`1419`
	`1420`	+If you need the IDNA 2008 standard from :rfc:`5891` and :rfc:`5895`, use the
	`1421`	+third-party `idna module <https://pypi.org/project/idna/>_`.
	`1422`	`+`
`1420`	`1423`	`These RFCs together define a protocol to support non-ASCII characters in domain`
`1421`	`1424`	`names. A domain name containing non-ASCII characters (such as`
`1422`	`1425`	``www.Alliancefrançaise.nu``) is converted into an ASCII-compatible encoding