Update cloudhub/modules/ROOT/pages/vpn-about.adoc

Co-authored-by: Hanna Nelson <hanna.nelson@mulesoft.com>

Author: luanamulesoft

cloudhub/modules/ROOT/pages/vpn-about.adoc

@@ -138,7 +138,7 @@ The following network devices are known to work with the Anypoint VPN. If your d
 * 4.30 or later for dynamically routed Anypoint VPN connections
 |===
 
-If there is not a specific *Device Configuration* file downloadable from the *Get VPN Config* menu for any of the listed devices, use the *Generic* VPN configuration file.
+If there is no specific *Device Configuration* file downloadable from the *Get VPN Config* menu for any of the listed devices, use the *Generic* VPN configuration file.
 
 image::vpn-device-generic-config.png[Generic VPN configuration file.]