Remove Emacs specific keys to make the instructions more editor agnostic

beaglebone.txt

@@ -854,7 +854,7 @@ MACs hmac-sha2-512,hmac-sha2-256,hmac-ripemd160
 KexAlgorithms diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1
 #+END_SRC
 
-CTRL-x CTRL-s to save, then CTRL-x CTRL-c to exit.  Now clear out any pre-existing host keys and reconfigure the ssh server.
+Save and exit.  Now clear out any pre-existing host keys and reconfigure the ssh server.
 
 #+BEGIN_SRC: bash
 rm /etc/ssh/ssh_host_*
@@ -949,7 +949,7 @@ If you want to know what a typical /crontab/ file might look like then see the [
 editor /etc/hostname
 #+END_SRC
 
-CTRL-x CTRL-s to save, then CTRL-x CTRL-c to exit.
+Save and exit.
 
 Also issue the command, replacing /mydomainname.com/ with your domain name.