Clarify Unifi options including UEFI filename

readme-vars.yml

@@ -68,11 +68,18 @@ app_setup_block: |
  * UEFI 64 bit file name- `netboot.xyz.efi`
 
  #### Unifi Security Gateway (with the controller)
- Networks -> LAN (or the network you want to boot from) -> ADVANCED DHCP OPTIONS
- * tick Enable network boot
- * Server- YOURSERVERIP
- * Filename- `netboot.xyz.kpxe`
- Advanced full support
+ Go to Settings -> Networks -> LAN (or the network you want to boot from). Find DHCP Service Management and click "Show Options" to expand that section and set these options:
+
+ * Tick "Network Boot"
+ * Server - YOURSERVERIP
+ * Filename - set to one of the following, based on the type of the machines you're installing:
+ * UEFI (32 or 64 bit) - `netboot.xyz.efi`
+ * BIOS - `netboot.xyz.kpxe`
+
+
+ #### Unifi Security Gateway (Using SSH)
+
+ As an alternative to the Unifi controller, you may use SSH to create or modify the config files directly. This allows for more configuration than the UI:
  * For USG variants force provisioning a json containing the same config used for EdgeOS (shown below) will fully support netboot.
  * For UDM variants, creating a valid dnsmasq config and placing in /run/dnsmasq.conf.d will load the config, but will not survive reboots or firmware updates [source](https://community.ui.com/questions/PXE-Network-boot-UDM-SE-Serving-files-conditionally-based-on-architecture/1843fcf6-87d5-4305-bc1d-4e55619ebb10).