Correct spelling mistakes.

code/game/ai_dmq3.c

@@ -2759,7 +2759,7 @@ bot_moveresult_t BotAttackMove(bot_state_t *bs, int tfl) {
 		bs->flags ^= BFL_STRAFERIGHT;
 		bs->attackstrafe_time = 0;
 	}
-	//bot couldn't do any usefull movement
+	//bot couldn't do any useful movement
 //	bs->attackchase_time = AAS_Time() + 6;
 	return moveresult;
 }
@@ -4862,7 +4862,7 @@ void BotCheckEvents(bot_state_t *bs, entityState_t *state) {
 			else*/
 #ifdef MISSIONPACK
 			if (!strcmp(buf, "sound/items/kamikazerespawn.wav" )) {
-				//the kamikaze respawned so dont avoid it
+				//the kamikaze respawned so don't avoid it
 				BotDontAvoid(bs, "Kamikaze");
 			}
 			else