[rhythmbox] help: Replace Bugzilla link with GitLab link

[Andre Klapper <aklapper src gnome org>]

commit 658ee659fa9df5fb8a8f49ace3c5591b25ff715f
Author: Andre Klapper <a9016009 gmx de>
Date:   Wed Jul 28 22:05:19 2021 +0200

    help: Replace Bugzilla link with GitLab link

 help/C/index.docbook | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/index.docbook b/help/C/index.docbook
index 2e0f138d3..3b42c20ff 100644
--- a/help/C/index.docbook
+++ b/help/C/index.docbook
@@ -819,7 +819,7 @@
                        </para>
         <tip>
           <para>
-                       <!-- Update once https://bugzilla.gnome.org/show_bug.cgi?id=792579 is fixed -->
+                       <!-- Update once https://gitlab.gnome.org/GNOME/rhythmbox/-/issues/1625 is fixed -->
                        By default, podcasts are downloaded in folder <filename 
class="directory">Music/</filename> in your home directory. To change location, 
                        see <xref linkend="prefs-podscast"/>.
                        </para>