Add links and cleanup formatting on multiple articles

wiki/source/2fa.md

@@ -7,7 +7,7 @@ author: deepend
 
 To get started, run the following command:
 
-   setup-2fa
+    setup-2fa
   
 Allow the command to update your Two-Factor Authentication. After running the
 command, you’ll be asked a couple of questions, the first one being:
@@ -24,7 +24,7 @@ only be used once, so they really are in case of emergency.
 You’ll then be prompted with several questions,  The choices are all
 about balancing security with ease-of-use. It begins with:
 
-   Do you want me to update your "~/.google_authenticator" file (y/n)
+    Do you want me to update your "~/.google_authenticator" file (y/n)
 
 You will need to answer 'yes'(y) for two-factor authentication to work with your login.