Based on the provided text, what is the distinction between a 'knowledge text' and a 'Guru's biography'?

The source material in Chapter 0 draws a clear distinction between two types of texts. It describes 'knowledge texts' as being purely for worldly and spiritual knowledge, without being biographical. On the other hand, a 'Guru's biography' is defined as a reliable and true book specifically describing a Guru's incarnation, life from childhood to old age, wonderful plays (Leelas), incomparable miracles, and the works of their incarnation. While different in content, the text notes that studying and reciting either type is considered a form of incomparable and salvation-granting Guru service for those who revere the authors or the texts as their Guru.