Add subtitle to GroupsPage

src/pages/groups/GroupsPage.tsx

@@ -8,7 +8,11 @@ export default function GroupsPage() {
   const {pageVariant} = useSelect()
 
   return (
-    <Page variant={pageVariant} title="Groups">
+    <Page
+      variant={pageVariant}
+      title="Groups"
+      subtitle="Manage your user groups here. Projects can also be shared with groups instead of single users."
+    >
       <PageActions leftActions={<GroupsActions />} />
       <GroupsTableFilterMenu />
       <GroupsTable />