Remove a separator line in CODEOWNERS (#4326)

Author: AA-Turner

.github/CODEOWNERS

@@ -659,7 +659,6 @@ peps/pep-0777.rst  @warsaw
 # ...
 peps/pep-0779.rst  @Yhg1s @colesbury @mpage
 peps/pep-0780.rst  @lysnikolaou
-# ...
 peps/pep-0781.rst  @methane
 # ...
 peps/pep-0789.rst  @njsmith