fix(docs): Fix link to `BT_CTLR_TX_PWR` adjustment in Zephyr docs

docs/docs/troubleshooting.md

@@ -105,7 +105,7 @@ Some users may experience a poor connection between the keyboard and the host. T
 CONFIG_BT_CTLR_TX_PWR_PLUS_8=y
 ```
 
-For the `nRF52840`, the value `PLUS_8` can be set to any multiple of four between `MINUS_20` and `PLUS_8`. The default value for this config is `0`, but if you are having connection issues it is recommended to set it to `PLUS_8` because the power consumption difference is negligible. For more information on changing the transmit power of your BLE device, please refer to [the Zephyr docs.](https://docs.zephyrproject.org/latest/reference/kconfig/CONFIG_BT_CTLR_TX_PWR_PLUS_8.html)
+For the `nRF52840`, the value `PLUS_8` can be set to any multiple of four between `MINUS_20` and `PLUS_8`. The default value for this config is `0`, but if you are having connection issues it is recommended to set it to `PLUS_8` because the power consumption difference is negligible. For more information on changing the transmit power of your BLE device, please refer to [the Zephyr docs.](https://docs.zephyrproject.org/latest/kconfig.html#CONFIG_BT_CTLR_TX_PWR)
 
 ### Other notes and warnings