doc: fix broken link on howto/unicode page (#13160)

Thank you @redshiftzero on the first PR :clap:

diff --git a/Doc/howto/unicode.rst b/Doc/howto/unicode.rst
index 5339bf45bf0e804d8ebcda1638c54ea711f15e9c..7b2d7b8abf87e821d4c30b6cf2cc269e9eede231 100644 (file)
--- a/Doc/howto/unicode.rst
+++ b/Doc/howto/unicode.rst
@@ -157,7 +157,7 @@ difficult reading.  `A chronology <http://www.unicode.org/history/>`_ of the
 origin and development of Unicode is also available on the site.
 
 On the Computerphile Youtube channel, Tom Scott briefly
-`discusses the history of Unicode and UTF-8 <https://www.youtube.com/watch?v=MijmeoH9LT4>`
+`discusses the history of Unicode and UTF-8 <https://www.youtube.com/watch?v=MijmeoH9LT4>`_
 (9 minutes 36 seconds).
 
 To help understand the standard, Jukka Korpela has written `an introductory