some beautification

content/tutorials/hardware/adc.md

@@ -9,7 +9,6 @@ aliases:
 This example is a simple ADC sample. For more information please see [`ADC`](/firmwareapi/pycom/machine/adc).
 
 ```python
-
 from machine import ADC
 adc = ADC(0)
 adc_c = adc.channel(pin='P13')
@@ -22,7 +21,6 @@ adc_c.value()
 Currently the ESP32's ADC is not calibrated from the factory. This means it must be calibrated each time you wish to use it. To do this you must firstly measure the internal voltage reference. The following code will connect the 1.1v reference to `P22`
 
 ```python
-
 from machine import ADC
 adc = ADC()
 
@@ -33,7 +31,6 @@ adc.vref_to_pin('P22')
 Now that the voltage reference is externally accessible you should measure it with the most accurate voltmeter you have access to. Note down the reading in millivolts, e.g. `1120`. To disconnect the 1.1v reference from `P22` please reset your module. You can now calibrate the ADC by telling it the true value of the internal reference. You should then check your calibration by connecting the ADC to a known voltage source.
 
 ```python
-
 # Set calibration - see note above
 adc.vref(1100)
 

content/tutorials/hardware/i2c.md

@@ -9,7 +9,6 @@ aliases:
 The following example receives data from a light sensor using I2C. Sensor used is the BH1750FVI Digital Light Sensor.
 
 ```python
-
 import time
 from machine import I2C
 import bh1750fvi
@@ -28,7 +27,6 @@ while(True):
 Place this sample code into a file named `bh1750fvi.py`. This can then be imported as a library.
 
 ```python
-
 # Simple driver for the BH1750FVI digital light sensor
 
 class BH1750FVI:
@@ -56,7 +54,6 @@ class BH1750FVI:
 This is the same code, with added LoRa connectivity, sending the lux value from the light sensor to another LoRa enabled device.
 
 ```python
-
 import socket
 import time
 import pycom

content/tutorials/hardware/owd.md

@@ -10,8 +10,7 @@ This tutorial explains how to connect and read data from a DS18x20 temperature s
 
 ## Basic usage
 
-```python
-
+```
 import time
 from machine import Pin
 from onewire import DS18X20
@@ -31,7 +30,6 @@ while True:
 ## Library
 
 ```python
-
 #!/usr/bin/env python3
 
 """