AP_Stats: Improve reset documentation (NFC)

libraries/AP_Stats/AP_Stats.cpp

@@ -32,8 +32,8 @@ const AP_Param::GroupInfo AP_Stats::var_info[] = {
     AP_GROUPINFO("_RUNTIME",    2, AP_Stats, params.runtime, 0),
 
     // @Param: _RESET
-    // @DisplayName: Reset time
-    // @Description: Seconds since January 1st 2016 (Unix epoch+1451606400) since reset (set to 0 to reset statistics)
+    // @DisplayName: Statistics Reset Time
+    // @Description: Seconds since January 1st 2016 (Unix epoch+1451606400) since statistics reset (set to 0 to reset statistics)
     // @Units: s
     // @ReadOnly: True
     // @User: Standard

libraries/AP_Stats/AP_Stats.h

@@ -17,7 +17,7 @@ public:
     // init() to set initial values from the parameters!
     uint32_t flttime; // seconds in flight (or driving)
     uint32_t runtime; // total wallclock time spent running ArduPilot (seconds)
-    uint32_t reset; // last time parameters were reset
+    uint32_t reset;   // last time AP_Stats parameters were reset (in seconds since AP_Stats Jan 1st 2016)
     uint32_t flttime_boot; // seconds in flight (or driving), at boot
     
     void init();