change linux dns code example

Example 1: change dns linux

sudo vim /etc/resolvconf/resolv.conf.d/base

# add nameserver(s) like this.
nameserver 8.8.8.8
nameserver 8.8.4.4

$ sudo resolvconf -u

Example 2: change dns resolver linux

$ sudo vim /etc/resolvconf/resolv.conf.d/base