Added the font file and some little fixes.

doc/decoder.dot

 digraph decoder {
-  "app" [ label="Application"
-          color="blue4" ];
-  "psi_dec" [ label="PSI decoder"
-              color="red3" ];
-  "specific_dec" [ label="Specific decoder"
-                   color="green4" ];
+  "app"                 [ shape="box"
+                          label="Application"
+                          color="blue4"
+                          fontname="Helvetica" ];
+  "psi_dec"             [ shape="box"
+                          label="PSI decoder"
+                          color="red3"
+                          fontname="Helvetica" ];
+  "specific_dec"        [ shape="box"
+                          label="Specific decoder"
+                          color="green4"
+                          fontname="Helvetica" ];
 
   app -> psi_dec -> specific_dec -> app
 }

doc/index.doxygen

@@ -10,7 +10,7 @@ describes how to use it and the "C" API.</p>
 
 <h2>What is libdvbpsi ?</h2>
 
-<p><em>libdvbpsi</em> is a set of tools which allows to decode and generate all the Program specific Information (<em>PSI</em>) present in a MPEG2 TS or a DVB stream. The two keywords are <em>portability</em> and <em>simplicity</em></p>
+<p><em>libdvbpsi</em> is a set of tools which allows to decode and generate all the Program specific Information (<em>PSI</em>) present in a MPEG2 TS or a DVB stream. The two keywords are <em>portability</em> and <em>simplicity</em>.</p>
 
 <h2>Currently supported tables</h2>