Update flashing_os.md (#395)

Added verbiage for clarity under the zerow w/o header
Modified the update instructions to fall in line with whats being posted in #news
Added proxy verbiage

pages/flashing_os.md

@@ -51,7 +51,7 @@ Decompress and flash image and follow to the [final steps](#the-final-steps). Be
     Save, unmount and follow the next step.
     
     **NOTE** - This can also be applied to the latest Rpi4 images, it is however easier to set this up using `wifi-menu -o`
-    <br></br>**NOTE** - For ZeroW w/o header, if you add this [device](https://www.pishop.us/product/solderless-serial-to-usb-adapter-for-raspberry-pi-zero/), this will add a local console without breaking the current overlay. For example: Look for `ZeroW console serial` in windows and update the driver from the [VCP driver section](https://ftdichip.com/drivers/vcp-drivers/)
+    <br></br>**NOTE** - For ZeroW w/o header, if you add this [device](https://www.pishop.us/product/solderless-serial-to-usb-adapter-for-raspberry-pi-zero/), this will add a local console without breaking the current overlay. To Access for example: Look for `ZeroW console serial` in windows and update the driver from the [VCP driver section](https://ftdichip.com/drivers/vcp-drivers/)
 
 2. When the process is complete, pull out the memory card and insert it into the Raspberry Pi. Connect the Raspberry Pi to the power supply. Your device will obtain the IP address via DHCP automatically. <br>:exclamation:Windows users: balenaEtcher will automatically safely remove the memory card. If you are using a Windows version prior to Windows 10 1809 and a different flashing software, you should do the safe remove manually.
 
@@ -66,10 +66,11 @@ Decompress and flash image and follow to the [final steps](#the-final-steps). Be
 6. After installation, we recommend you to update your operating system:
     ```
     rw
-    pacman -Syy
-    pacman -Su
+    pacman -Syu
     reboot
     ```
+    **NOTE** - PROXY servers make networks behave not in a normal manor, therefor, may or may not update properly. The end user is ultimately responsible for coming up with solutions to combat this.
+    
 7. Pacman saves all installed packages in a compressed format so that you can roll back to the old version if something goes wrong. After you've updated and made sure everything works, it makes sense to clear the package cache so that it doesn't take up space on the SD card:
     ```
     # rw