Doc: Fix link formatting typo (GH-91659)

(cherry picked from commit 6a7a8a7)

Co-authored-by: slateny <46876382+slateny@users.noreply.github.com>

Author: miss-islington

Doc/library/codecs.rst

@@ -1423,7 +1423,7 @@ Internationalized Domain Names (IDN)). It builds upon the ``punycode`` encoding
 and :mod:`stringprep`.
 
 If you need the IDNA 2008 standard from :rfc:`5891` and :rfc:`5895`, use the
-third-party `idna module <https://pypi.org/project/idna/>_`.
+third-party `idna module <https://pypi.org/project/idna/>`_.
 
 These RFCs together define a protocol to support non-ASCII characters in domain
 names. A domain name containing non-ASCII characters (such as