Fix grammar error

lib/network.js

@@ -289,7 +289,7 @@ function getWindowsIfaceDNSsuffix(ifaces, ifacename) {
     return dnsSuffix ;
   } catch (error) {
     console.log('Error getting Connection-specific DNS suffix: ', error.message);
-    return 'Unknow';
+    return 'Unknown';
   }
 }
 
@@ -413,10 +413,10 @@ function getLinuxIfaceDHCPstatus(connectionName) {
       }
       return dhcStatus;
     } catch (e) {
-      return 'Unknow';
+      return 'Unknown';
     }
   } else {
-    return 'Unknow';
+    return 'Unknown';
   }
 }
 
@@ -429,10 +429,10 @@ function getLinuxIfaceDNSsuffix(connectionName) {
       const dnsSuffix = resultFormat.split(" ").slice(1).toString();
       return dnsSuffix == '--' ? '': dnsSuffix;
     } catch (e) {
-      return 'Unknow';
+      return 'Unknown';
     }
   } else {
-    return 'Unknow';
+    return 'Unknown';
   }
 }
 
@@ -603,7 +603,7 @@ function networkInterfaces(callback) {
                 if (iface === 'lo' || iface.startsWith('bond')) { type = 'virtual'; }
               }
               if (_windows) {
-                authProtocol = 'Unknow';
+                authProtocol = 'Unknown';
                 dnsSuffix = getWindowsIfaceDNSsuffix(dnsSuffixes.ifaces, dev);
                 nics.forEach(detail => {
                   if (detail.mac === mac) {