Better render of links

content/01_Install.md

@@ -23,8 +23,7 @@ But if you are using Ubuntu the following command line should be enough:
     [Ubuntu]> sudo apt-get install ruby rake
 
 2. In order to install the %kramdown gem:
-
-    > gem install kramdown
+   <pre>> gem install kramdown</pre>
 
 3. To install %xelatex, I suggest you to use [TexLive](http://www.tug.org/texlive/) full install to be certain not lacking anything. 
 Of course you are free to use any other distribution that suit you better.

filters/links.rb

@@ -4,7 +4,7 @@ class Links
             if $2 == '#'
                 $&
             else
-                $1+$3+%{<sup>*</sup>}+$4
+                $1+$3+%{<sup><sub>*</sub></sup>}+$4
             end
         end
     end