triage-policies: update the bugbot::close wording and link to the wiki

Now that we have a wiki page let's link to it, it has all the details
on how and why we (plan to) do this.

Also change the wording to be make it easier to anthropomorphize bugbot
when it adds that comment, ideally leading to fewer grumpy users.

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1093>

.triage-policies.yml

@@ -145,11 +145,17 @@ resource_rules:
           remove_labels:
             - "bugbot::close"
           comment: |
-            I'm (temporarily) closing this bug. The bug may not be fixed yet (see any comments above)
-            but unfortunately closing/re-opening is the only action all GitLab users are permitted to
-            do. So we close it, you re-open it when whatever above has been addressed and
-            then we know we need to look at it again. This may happen more than once in this issue but
-            I'll only post this once.
+            I'm temporarily closing this bug. The bug may not be fixed yet (see any comments above)
+            and we **want you to reopen it when/if it becomes actionable again**.
+
+            This process may feel unfamiliar but unfortunately closing/re-opening is the only action
+            all GitLab users are permitted to do. So we close it, you re-open it when whatever
+            above has been addressed and then we know we need to look at it again.
+            This issue may be closed more than once in a similar fashion but I only leave this
+            comment once since now you understand how it works. :smile:
+
+            For a detailed explanation on the how and why of this process please see
+            the [Closed Issues wiki page](https://gitlab.freedesktop.org/libinput/libinput/-/wikis/Closed-Issues).
           status: "close"
       - *close_needinfo
       - *remind_needinfo