FPGA doc: Some additions

doc/doxygen/chapters/440_fpga_support.doxy

@@ -182,7 +182,11 @@ int main(int argc, char **argv)
     /* Implementation of an engine */
     max_engine_t *engine = max_load(maxfile, "*"); 
 
-    ...
+    starpu_init(NULL);
+
+    ... Task submission etc. ...
+
+    starpu_shutdown();
 
     /* deallocate the set of actions */
     max_actions_free(act);
@@ -190,7 +194,7 @@ int main(int argc, char **argv)
     /* unload and deallocate an engine obtained by way of max_load */
     max_unload(engine);
     
-    ...
+    return 0;
 }
 \endcode
 
@@ -211,6 +215,8 @@ In the <c>main</c> function, there are four important steps:
 - Free actions.
 - Unload and deallocate the DFE.
 
+The rest of the application (data registration, task submission, etc.) is as usual with StarPU
+
 \subsection FPGAConfiguration FPGA Configuration
 
 To configure StarPU with FPGA accelerators, we can enable <c>FPGA</c> through the \c configure option <b>"--with-fpga"</b>.
@@ -238,7 +244,8 @@ $ export LD_LIBRARY_PATH=$MAXELEROSDIR/lib:$LD_LIBRARY_PATH
 $ export SLIC_CONF="use_simulation=StreamFMA"
 \endverbatim
 
-- To disable the use of CPU cores, we can set the \ref STARPU_NCPU environment variable to 0.
+- To force tasks to be scheduled on the FPGA, one can disable the use of CPU
+cores by setting the \ref STARPU_NCPU environment variable to 0.
 \verbatim
 $ STARPU_NCPU=0 ./StreamFMA
 \endverbatim