No, it was never in his book, rather it was a promotional pamphlet circulated amongst other literary agents, which was not written by President Obama (nor was it approved, or even distributed to him). The person (Miriam Goderich) who wrote that particular promotional piece has admitted that it was a mistake.
"This was nothing more than a fact checking error by me--an agency assistant at the time," Goderich wrote in an emailed statement to Yahoo News. "There was never any information given to us by Obama in any of his correspondence or other communications suggesting in any way that he was born in Kenya and not Hawaii. I hope you can communicate to your readers that this was a simple mistake and nothing more."
The same article states (emphasis mine):
According to a promotional booklet produced by the agency, Acton & Dystel,
And the agent also states the same to this news agency. And they also state (emphasis mine):
for circulation within the publishing industry only
Even Breitbart (who doesn't buy into the birther nuttery) also states that the pamphlet was produced by the agency, and was not in President Obama's book:
Breitbart News has obtained a promotional booklet produced in 1991 by Barack Obama's then-literary agency, Acton & Dystel, which touts Obama as "born in Kenya and raised in Indonesia and Hawaii."
The booklet, which was distributed to "business colleagues" in the publishing industry, includes a brief biography of Obama among the biographies of eighty-nine other authors represented by Acton & Dystel.
Note the distinct assertions: produced by Acton & Dystel; distributed in the publishing industry; that this wasn't Obama's book, but rather a listing of 90 authors.
Now, I will give The Trump the benefit of some doubt, and he may just be mis-stating what he heard. However, his history of behaviour and bombastic (thanks Skava for reminding me of that word) style indicates this will become a revisionist position to Mr. Trump. Now that he has stated it, he will not retract from his position, no matter how wrong he may be.
Also related Is Barack Obama a natural born US citizen?