doc: add missing links

doc/doxygen/chapters/000_introduction.doxy

@@ -291,6 +291,7 @@ The documentation chapters include
 </ul>
 <li> Part 4: StarPU Extensions
 <ul>
+<li> \ref PythonInterface
 <li> \ref OutOfCore
 <li> \ref MPISupport
 <li> \ref FaultTolerance
@@ -300,6 +301,7 @@ The documentation chapters include
 <li> \ref SimGridSupport
 <li> \ref OpenMPRuntimeSupport
 <li> \ref ClusteringAMachine
+<li> \ref InteroperabilitySupport
 </ul>
 <li> Part 5: StarPU Reference API
 <ul>