os.mkfs() replaced with os.fsformat()

os.mkfs() has been replaced with os.fsformat()

Link explaining the replacement details:
https://forum.pycom.io/topic/3351/new-development-firmware-release-v1-19-0-b1/2

Issue: https://forum.pycom.io/topic/5606/what-happened-to-pin_deepsleep_wakeup/9

Author: AnkithB2020

content/gettingstarted/programming/first-project.md

@@ -118,5 +118,5 @@ If you need to remove files from your device you have two options, either connec
 ```python
 
 import os
-os.mkfs('/flash')
+os.fsformat('/flash')
 ```

content/gettingstarted/programming/safeboot.md

@@ -35,7 +35,7 @@ If problems occur within the filesystem or you wish to factory reset your module
 ```python
 
 >>> import os
->>> os.mkfs('/flash')
+>>> os.fsformat('flash')
 ```
 
 {{% hint style="danger" %}}
@@ -59,4 +59,3 @@ A hard reset is the same as performing a power cycle to the device. In order to
 >>> import machine
 >>> machine.reset()
 ```
-

content/tutorials/lte/firmware.md

@@ -37,7 +37,7 @@ Please start with the following steps:
 2. Select Firmware Type `stable` in the communication window to upgrade to version `v1.18.1.r1`
 
 
-The modem firmware files are password protected, to download them you should be a forum.pycom.io member and access to: 
+The modem firmware files are password protected, to download them you should be a forum.pycom.io member and access to:
 Announcements & News -->  Announcements only for members --> Firmware Files for Sequans LTE modem now are secured, or clicking [Here](https://forum.pycom.io/topic/4020/firmware-files-for-sequans-lte-modem-now-are-secured).
 
 You can find the different versions of firmwares available [here](https://software.pycom.io/downloads/sequans2.html).
@@ -57,7 +57,7 @@ import sqnsupgrade
 sqnsupgrade.run('upgdiff_38638-to-39529.dup')
 ```
 If you are updating the Sequans firmware on your module for the first time, please use instead the file upgdiff_33080-to-39529.dup (1.2M) from the same archive.
-Similar upgrade packages are available for the NB-IoT firmwares. 
+Similar upgrade packages are available for the NB-IoT firmwares.
 {{% /hint %}}
 
 ## Via SD card
@@ -72,8 +72,11 @@ To transfer the firmware files onto the SD card you have two options:
 from machine import SD
 
 sd = SD()
-os.mkfs(sd)            # format SD card
-os.mount(sd, '/sd')    # mount it
+os.fsformat('/sd')    # format SD card
+from machine import SD
+sd = SD()
+fs = os.mkfat(sd)
+os.mount(fs, '/sd')     # mount it
 os.listdir('/sd')      # list its content
 ```
 
@@ -267,5 +270,3 @@ The latest version of the `sqnsupgrade` class has a few additional features that
 
 #### sqnsupgrade.run(load_fff=True)
     New optional command line option load_fff for the sqnsupgrade.run() command. This is designed to be an internal flag. And should only applied when advised by pycom support.
-    
-