Fixing doc.

doc/wsl2.md

@@ -23,6 +23,9 @@ cd /etc/ssh
 sudo ssh-keygen -A
 cd
 # set password authentication to on in /etc/ssh/sshd_config
+# this means open the file in a text editor and change the line that looks like
+#      PasswordAuthentication no
+# and change the no to a yes
 sudo service ssh start
 ```