Doxygen fixes

src/debug.c

@@ -32,6 +32,7 @@
  *the standard output.
  *
  * @param parts The array of particles.
+ * @param xparts The array of particle extended data.
  * @param id The id too look for.
  * @param N The size of the array of particles.
  *

src/runner.c

@@ -488,6 +488,7 @@ void runner_dogsort(struct runner *r, struct cell *c, int flags, int clock) {
  *
  * @param r The runner thread.
  * @param c The cell.
+ * @param timer 1 if the time is to be recorded.
  */
 
 void runner_doinit(struct runner *r, struct cell *c, int timer) {