Fix lint error

Author: emmatyping

peps/pep-0778.rst

@@ -206,7 +206,7 @@ Rejected Ideas
 ==============
 
 Just Use POSIX Symlinks Everywhere
----------------------------------
+----------------------------------
 
 This PEP wants to allow for ``LINKS`` to be used for a potential future :pep:`660` editable
 installation. This future PEP should support Windows, so it may need to use junctions.