development_process: Clarify that mailing devel@ is optional

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

content/guides/development_process.md

@@ -82,7 +82,8 @@ Clone the forked repository
   11. Artfully solicit missing information
   12. Award all ties to your reviewer
   13. Minimize lag between rounds of review
-* Notify maintainers on the devel [mailing list](https://lists.apertis.org/)
+* Maintainers usually monitor pending merge requests, but it can be helpful
+  to also mention them on the [`devel@` mailing list](https://lists.apertis.org/)
   when submitting or updating a merge request.
 * The repository
   [maintainer]({{< ref "contributions.md#the-role-of-maintainers" >}}) or