Update core-developers/become-core-developer.rst

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: Emir2099

core-developers/become-core-developer.rst

@@ -60,7 +60,7 @@ are granted through these steps:
      were in the form of a separate post on the already open topic with
      the poll.
 
-Getting a python.org Email Address
+Getting a python.org email address
 ----------------------------------
 
 Members of the core team can get an email address on the python.org domain. For more details refer to the `PSF Board Policies on Email Addresses <https://www.python.org/psf/records/board/policies/email/>`_.