Model ID set/retrieve docs

Added missing information on how to set Model ID on SPI based receivers
ExpressLRS · Sep 17, 2024 · a388e57 · a388e57
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commit a388e57
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diff --git a/docs/hardware/spi-receivers.md b/docs/hardware/spi-receivers.md
@@ -100,6 +100,12 @@ UID Bytes
 ```
 ```
 
+### Model ID
+
+In order to set or retrieve current Model ID through Betaflight you need to use CLI:
+- Set new Model ID: `set expresslrs_model_id = N`
+- Get current Model ID: `get expresslrs_model_id`
+
 #### Setting Binding Phrase
 Go to Betaflight CLI and enter the following commands.
 ```