stats: Fix documentation for osmo_stats_set_interval()

Change-Id: Ie07a03251d6fe9d40b62815feb51ec8af9ed7c95
diff --git a/src/stats.c b/src/stats.c
index b5adbf2..61b7df8 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -326,8 +326,7 @@
 	return 0;
 }
 
-/*! Set the reporting interval of a given stats_reporter (in seconds).
- *  \param[in] srep stats_reporter whose remote address is to be set
+/*! Set the reporting interval (common for all reporters)
  *  \param[in] interval Reporting interval in seconds
  *  \returns 0 on success; negative on error */
 int osmo_stats_set_interval(int interval)