Address CR feedback

 * Add note about possible need to add `.local` or `.home` suffix or use
   IP address instead of hostname.
 * Use title case for heading.

docs/developers/mobile.md

@@ -1,12 +1,17 @@
 # Mobile Development
 
-## Testing the client on a mobile device
+## Testing the Client on a Mobile Device
 
 If you have made changes to the client that could affect the mobile experience, it is a good idea to test them on a real device. Such changes should ideally be tested with at least current versions of iOS Safari and Chrome for Android.
 
 1. Make sure your development system and mobile device are on the same local network.
-1. Get the IP address or host name of your development system (`$HOSTNAME` in the steps below). You can do this using the `hostname` terminal command on Mac/Linux.
 1. Configure the "h" service to allow incoming connections from other systems by editing `conf/development-app.ini` and changing the `host` setting from `localhost` to `0.0.0.0`.
+1. Get the IP address or host name of your development system (`$HOSTNAME` in the steps below). You can do this using the `hostname` terminal command on Mac/Linux.
+
+   **Tip:** _If the output of `hostname` does not include a `.home` or `.local`
+   suffix, you may need to append `.local` to get a host name that is accessible from
+   other devices on the network. If you have problems using the host name, try
+   using the IP address instead._
 1. Configure the "h" service to load the client from this host and start the dev
    server:
    ```sh
@@ -30,5 +35,5 @@ If you have made changes to the client that could affect the mobile experience,
 
    gulp watch
    ```
-   When `gulp watch` runs, it will print out the URLs used for the "h" service and client assets. These should include `$HOSTNAME` instead of `localhost`.
+   **Tip:** _When `gulp watch` runs, it will print out the URLs used for the "h" service and client assets. These should include `$HOSTNAME` instead of `localhost`._
 1. On your mobile device, go to a page which has the client embedded such as `http://$HOSTNAME:3000` or `http://$HOSTNAME:5000/docs/help`.