DOCS: setting string

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

Author: jokob-sk

front/php/templates/language/en_us.json

@@ -247,7 +247,7 @@
     "Device_TableHead_Name": "Name",
     "Device_TableHead_NetworkSite": "Network Site",
     "Device_TableHead_Owner": "Owner",
-    "Device_TableHead_ParentRelType": "Relationship Type",
+    "Device_TableHead_ParentRelType": "Relationship",
     "Device_TableHead_Parent_MAC": "Parent node",
     "Device_TableHead_Port": "Port",
     "Device_TableHead_PresentLastScan": "Presence",