add custom section, in tandem with wiki info

patch.yml

@@ -6,6 +6,10 @@
 #       not available or patched out by upstream. These are potentially packages
 #       that should be available in the main distribution but are not, such as
 #       the servers package from openldap.
+# custom: Specifically added packages that are custom, and probably needed for
+#         some reason or another. This is generally very rare. For example,
+#         CentOS had centos-obsolete-packages. We thought it was a good idea
+#         and brought it in as "rocky-obsolete-packages".
 # previous: These are previously patched packages that are no longer patched in
 #           Rocky as they are upstreamed or it was found no longer required.
 # provides: These are specific branded packages that provide something else
@@ -88,6 +92,9 @@ plus:
     - thunderbird
   r9:
     - openldap-servers
+custom:
+  r8:
+    - rocky-obsolete-packages
 previous:
   r8:
     - acl