Name: set_day_desc - set the day description in a room

Syntax:
	#include <room2.h>
	set_day_desc(string day_desc)

Description:
	The set_day_desc call sets the day description in a room. The day
	description is displayed after the long description when a player
	enters the room or types 'look' and if it is day.

Return value: none

Examples:
	set_day_desc("You notice some carvings on the apple tree.\n");

See also: room/set_night_desc, room/set_long, room/query_day_desc