redo the VPC router one sentence bit

Author: david-crespo

app/pages/project/vpcs/RouterPage.tsx

@@ -184,7 +184,7 @@ export default function RouterPage() {
           <DocsPopover
             heading="routers"
             icon={<Networking16Icon />}
-            summary="Routers contain routes that control how traffic is forwarded from instances to external networks and other VPC subnets."
+            summary="A router is a collection of routes that control where traffic leaving a VPC subnet is forwarded based on its destination."
             links={[docLinks.routers, docLinks.routes]}
           />
           <MoreActionsMenu label="Router actions">