doc: Add internal links

wiki/src/about.mdwn

@@ -72,11 +72,12 @@ State-of-the-art cryptographic tools
 Tails also comes with a selection of tools to protect your data using strong
 encryption:
 
-  - Encrypt your USB sticks or external hard-disks using <span
+  - [[Encrypt your USB sticks or external
+    hard-disks|doc/encryption_and_privacy/encrypted_volumes]] using <span
     class="definition">[[!wikipedia LUKS]]</span>, the Linux standard for
     disk-encryption.
 
-  - Automatically encrypt with HTTPS all your communications to a number of
+  - [[Automatically encrypt with HTTPS all your communications to a number of
     major websites using [HTTPS
     Everywhere](https://www.eff.org/https-everywhere), a Firefox extension
     developped by the [Electronic Frontier Foundation](https://www.eff.org).