Revert "[Yun]: Documentation: Add eth to capabilities"

This reverts commit 1709bfe.

Author: amotl

doc/source/firmware/overview.md

@@ -107,7 +107,7 @@ transmitting sensor data using [MQTT] over [Wi-Fi].
 ::::
 ::::{grid-item}
 :columns: 4
-{bdg-primary-line}`eth` {bdg-primary-line}`wifi` {bdg-primary-line}`mqtt` {bdg-primary-line}`json`
+{bdg-primary-line}`wifi` {bdg-primary-line}`mqtt` {bdg-primary-line}`json`
 
 {bdg-success-line}`hx711` {bdg-success-line}`ads1231` {bdg-success-line}`ds18b20` {bdg-success-line}`dht22`