Arz kiya hai means Quote in Urdu. Before delivering Shayari or Gazals, Shayar & Gazalkars used to prefix these words to inform hearers that he is ready to perform for shayari or gazal. After hearing Arz kiya hai, hearers pay their attention toward shayar or gazalkar with interest.
The Book Arz kiya hai is Compiled with different types of Poets, it's in sense they're ready to perform.