kcm: improve description field in json

The kcm json currently lists the description as "Connect and sync your
devices". This is hard to distinguish from the KDE Connect application
at a glance, and does not follow the general pattern in kcm descriptions
to use either a configuration-based verb or noun (e.g. configure, edit,
settings).

This change sets the description to "Configure device synchronization".

BUG: 466256

kcm/kcm_kdeconnect.json

@@ -1,7 +1,7 @@
 {
     "KPlugin": {
         "BugReportUrl": "https://bugs.kde.org/enter_bug.cgi?product=systemsettings&component=kcm_kdeconnect",
-        "Description": "Connect and sync your devices",
+        "Description": "Configure device synchronization",
         "Description[ar]": "اتّصل وزامن أجهزتك",
         "Description[az]": "Cihazlarını qoş və eyniləşdir",
         "Description[bg]": "Свържете и синхронизирайте вашите устройства",