Unify beginning of command line code

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2012-c@13645 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Doc/Manual/C.html

@@ -85,7 +85,7 @@ int fact(int n);
 To build a C module (C as the target language), run SWIG using the <tt>-c</tt> option :</p>
 
 <div class="shell"><pre>
-%swig -c example.i
+$ swig -c example.i
 </pre></div>
 
 <p>
@@ -116,7 +116,7 @@ The following table list the additional commandline options available for the C
 </p>
 
 <div class="shell"><pre>
-swig -c -help 
+$ swig -c -help
 </pre></div>
 
 <table summary="C specific options">