Add Frequency Slot and Modem Preset to Config

With folks learning about our mesh at other events, it's helpful to make sure they're on the right preset and frequency when they come home.

Author: brimstone

docs/config.md

@@ -24,11 +24,13 @@ These settings are intended to facilitate a stable and reliable mesh network. Th
 
 ### LoRa
 
-|        Option | Recommended Config | Notes                                                                                            |
-| ------------: | :----------------- | :----------------------------------------------------------------------------------------------- |
-| ^^Hop limit^^ | `5`                | Please do not set this higher than `6`. :pray: The mesh thanks you.                              |
-|   Ignore MQTT | `True`             | This is enabled on most `ROUTER` nodes in our mesh.                                              |
-|    OK to MQTT | `True`             | Added in `2.5.0`. Enable to show up on online tools like [info.MtnMe.sh](https://info.mtnme.sh). |
+|         Option | Recommended Config | Notes                                                                                            |
+| -------------: | :----------------- | :----------------------------------------------------------------------------------------------- |
+|   Modem Preset | LONG_FAST          | This is the default.                                                                             |
+|  ^^Hop limit^^ | `5`                | Please do not set this higher than `6`. :pray: The mesh thanks you.                              |
+| Frequency Slot | 20                 | This is the default. It equates to 906.875 MHz                                                   |
+|    Ignore MQTT | `True`             | This is enabled on most `ROUTER` nodes in our mesh.                                              |
+|     OK to MQTT | `True`             | Added in `2.5.0`. Enable to show up on online tools like [info.MtnMe.sh](https://info.mtnme.sh). |
 
 ## Module configuration