Added a note about the warning messages during installation.
Added a note about the warning messages during installation.

jturner314/raspbian-ua-netinst,FooDeas/raspberrypi-ua-netinst,racing-tech/rrp-raspi-installer,beylsp/rpi-installer,beylsp/rpi-installer,matt2005/raspbian-ua-netinst,daytonpid/FireHawk,kolargol/raspbian-ua-netinst,Zeerix/raspbian-ua-netinst,firepick/FireHawk,racing-tech/rrp-raspi-installer,malsony/raspbian-ua-netinst,yodaaut/raspbian-ua-netinst,cybercircuits/raspbian-ua-netinst,dicer/raspbian-ua-netinst