First of all, why did you run these commands? Anyway, the last one sets up the
11n_disable=1 option for the
iwlwifi driver. Presumably this is what is breaking your system so, just open the file
sudo gedit /etc/modprobe.d/iwlwifi.conf
Find this line:
options iwlwifi 11n_disable=1
And delete it. Then reboot (not needed but it is the simplest approach). Your WiFi settings should now be back to the way they were before you broke them. I am assuming that you did all this to try and solve another issue and suggest that you might want to post a new question explaining that issue and asking for help about that.