docs: reaffirm not using contributor comments

This was first brought up in pmaports#543, but a few contributor
comments have snuck in over time. This reaffirms that we don't use
them.

Signed-off-by: Aster Boese <asterboese@mailbox.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8950>

docs/packaging.md

@@ -36,6 +36,18 @@ Packages can also have Co-Maintainers, which are identified by a comment like:
 Maintainers and Co-Maintainers will be pinged whenever changes to their packages
 are made.
 
+Packages shall not have contributors comments, which are commonly used in
+Alpine with:
+
+```sh
+# Contributor: Jean Doe <jean@example.org>
+```
+
+For devices specifically: if it is useful to list someone who has worked on a
+device who would be available for contact for questions about the device,
+consider adding them under a "Maintainers" section of the
+[device's wiki page](https://wiki.postmarketos.org/wiki/Device_specific_package).
+
 ## Package versioning (pkgver, pkgrel)
 
 Whenever you update a package, the version should also be incremented. A version