Improve file analysis doxygen comments.

src/file_analysis/FileTimer.h

@@ -13,11 +13,20 @@ namespace file_analysis {
  */
 class FileTimer : public Timer {
 public:
+
+	/**
+	 * Constructor, nothing interesting about it.
+	 * @param t unix time at which the timer should start ticking.
+	 * @param id the file identifier which will be checked for inactivity.
+	 * @param interval amount of time after \a t to check for inactivity.
+	 */
 	FileTimer(double t, const string& id, double interval);
 
 	/**
 	 * Check inactivity of file_analysis::File corresponding to #file_id,
 	 * reschedule if active, else call file_analysis::Manager::Timeout.
+	 * @param t current unix time
+	 * @param is_expire true if all pending timers are being expired.
 	 */
 	void Dispatch(double t, int is_expire);