doc: Formatting.

wiki/src/doc/first_steps/manual_usb_installation.intro.mdwn

-It is recommended to use the [[Tails USB installer|usb_installer]] to install
+It is recommended to use the
+<span class="application">[[Tails USB installer|usb_installer]]</span> to install
 Tails onto a USB stick. But you might need to use this technique to get a first
-running Tails, and be able to use the USB installer on a second USB stick.
+running Tails, and be able to use the
+<span class="application">Tails USB installer</span> on a second USB stick.
 
 **This technique doesn't allow you to setup a persistent storage.**

wiki/src/doc/first_steps/startup_options/administration_password.mdwn

@@ -9,7 +9,6 @@ For example:
   - To execute commands with <span class="command">sudo</span>
 
 **By default, the administration password is disabled for better security.**
-
 This can prevent an attacker with physical or remote access to your Tails system
 to gain administration privileges and perform administration task without your
 knowledge.

wiki/src/doc/first_steps/usb_installer.mdwn

@@ -10,7 +10,7 @@ In order to use <span class="application">Tails USB installer</span>, you need
 to start Tails from another media, and clone it onto the USB stick that you want
 to install. You can either:
 
-  - **[[Burn a Tails CD.|download#index4h1]]** (recommended).
+  - **[[Burn a Tails CD|download#index4h1]]** (recommended).
   - **Use another Tails USB stick**, version 0.11 or later, for example from a friend.
   - **[[Manually install Tails onto another USB
     stick|manual_usb_installation]]**, if you can't use a CD.
@@ -29,7 +29,8 @@ Instructions
    <span class="menuchoice">
      <span class="guimenu">Applications</span>&nbsp;▸
      <span class="guisubmenu">Tails</span>&nbsp;▸
-     <span class="guimenuitem">Tails USB installer</span></span>
+     <span class="guimenuitem">Tails USB installer</span>
+   </span>
    to start <span class="application">Tails USB installer</span>.
 
 3. To install onto a new USB stick, click on the <span class="button">Clone &