Fix SBUS2 sensor units; use headspeed instead of eRPM (#135)

* Fix temperatur unit

* Fix some units

Temperatures and pwm were reading wrong.

Change rpm source to match rpm sensor, as erpm didn't seem to match actual headspeed in my tests with hobbywing v4 based esc. (align 300x combo esc)

* Add note about gear ratio in RPM and Kontronik ESC sensors

docs/Telemetry.md

@@ -345,7 +345,7 @@ It runs at a fixed baud rate of 100000 8e2.
 ```
 
 ### Radio Configuration
-The following sensors should setup on your radio
+The following sensors should setup on your radio and Gear ratio for RPM Sensor and Kontronik ESC to 1.00 in your radio.
 | Slot | Sensort Type | Notes |
 | --- | --- | --- |
 | 1 | Voltage | FC Voltage sensor. Pack and cell voltages |

src/main/telemetry/sbus2.c

@@ -98,7 +98,7 @@ void handleSbus2Telemetry(timeUs_t currentTimeUs)
 
     if (escData != NULL) {
         // 8 slots, esc
-        send_kontronik(8,  escData->voltage * 0.1f, escData->consumption * 100, escData->erpm, escData->current * 0.01f , escData->temperature * 10, escData->temperature2 * 10, escData->bec_current * 10, escData->pwm);
+        send_kontronik(8,  escData->voltage * 0.1f, escData->consumption * 100, rpm, escData->current * 0.01f, escData->temperature * 0.1f, escData->temperature2 * 0.1f, escData->bec_current * 10, escData->pwm * 0.1f);
     }
 }
 
@@ -160,4 +160,4 @@ FAST_CODE void taskSendSbus2Telemetry(timeUs_t currentTimeUs)
     }
 }
 
-#endif
+#endif