Fix SSH page format for syntax highlighting

common/ssh.md

@@ -1,12 +1,16 @@
-SSH, or Secure Shell, is a protocol used to securely log onto remote systems.
->  a program used for logging or executing commands on a remote server.
+# SSH
+
+> Secure Shell is a protocol used to securely log onto remote systems.
+> It can be used for logging or executing commands on a remote server.
 
 - connecting to a remote server
-`ssh username@remote_host`
+
+`ssh {{username}}@{{remote_host}}`
 
 - connecting to a remote server with specific port
-`ssh username@remote_host` -P 2222
+
+`ssh {{username}}@{{remote_host}} -P {{2222}}`
 
 - ssh tunneling
-`ssh -D 9999 -C username@remote_host`
-~                                   
+
+`ssh -D {{9999}} -C {{username}}@{{remote_host}}`