chore(samples): add test comments (#705)

Author: FrodoTheTrue

compute/instances/windows/creating-managing-windows-instances/createWindowsServerInstanceExternalIP.js

@@ -72,7 +72,7 @@ function main(
                 name: 'External NAT',
               },
             ],
-            // If you going you use custom VPC network, it must be configured to allow access to kms.windows.googlecloud.com.
+            // If you are using a custom VPC network it must be configured to allow access to kms.windows.googlecloud.com.
             // https://cloud.google.com/compute/docs/instances/windows/creating-managing-windows-instances#kms-server.
             name: 'global/networks/default',
           },

compute/instances/windows/creating-managing-windows-instances/createWindowsServerInstanceInternalIP.js

@@ -16,7 +16,7 @@
  * Creates a new Windows Server instance that has only an internal IP address.
  *
  * @param {string} projectId - ID or number of the project you want to use.
- * @param {string} zone - Name of the zone you want to use, for example: us-west3-b
+ * @param {string} zone - Name of the zone in which your instance is located, for example: us-west3-b
  * @param {string} instanceName - Name of the new machine.
  * @param {string} machineType - Machine type you want to create in following format:
  *    "zones/{zone}/machineTypes/{type_name}". For example: