help: temp-target and temp-overheat had identical descriptions that do not describe what they actually do.

Closes https://github.com/veox/sgminer/issues/65

sgminer.c

@@ -1293,16 +1293,16 @@ static struct opt_table opt_config_table[] = {
 #ifdef HAVE_ADL
 	OPT_WITH_ARG("--temp-cutoff",
 		     set_temp_cutoff, opt_show_intval, &opt_cutofftemp,
-		     "Temperature where a device will be automatically disabled, one value or comma separated list"),
+		     "Temperature which a device will be automatically disabled at, one value or comma separated list"),
 	OPT_WITH_ARG("--temp-hysteresis",
 		     set_int_1_to_10, opt_show_intval, &opt_hysteresis,
 		     "Set how much the temperature can fluctuate outside limits when automanaging speeds"),
 	OPT_WITH_ARG("--temp-overheat",
 		     set_temp_overheat, opt_show_intval, &opt_overheattemp,
-		     "Overheat temperature when automatically managing fan and GPU speeds, one value or comma separated list"),
+		     "Temperature which a device will be throttled at while automanaging fan and/or GPU, one value or comma separated list"),
 	OPT_WITH_ARG("--temp-target",
 		     set_temp_target, opt_show_intval, &opt_targettemp,
-		     "Target temperature when automatically managing fan and GPU speeds, one value or comma separated list"),
+		     "Temperature which a device should stay at while automanaging fan and/or GPU, one value or comma separated list"),
 #endif
 	OPT_WITHOUT_ARG("--text-only|-T",
 			opt_set_invbool, &use_curses,