The color space you choose when shooting in RAW is stored as a marker in the image's metadata. It is displayed with that color space applied when you open the file on your computer. Being a RAW file, it can be changed at any time to the other color space and it will be as if you used the new color space when you shot the image. It really doesn't matter which color space you use when shooting in RAW.
However, that said, most people leave the color space intact when they do the JPEG conversion and unless you remember to specifically change the color space at the time of conversion, you may be left with a lesser color space, since the camera defaults to sRGB from the factory.
I think I will clarify that text in the next book in that section so that this question will not arise again. Also, the book does clarify, later on, that it does not matter which color space you use in RAW since it can be changed.
Additionally, not setting the correct color space adds a step when you do the conversion.
Finally, if you happen to switch to JPEG, in the middle of things, whatever color space you've selected will be applied immediately and permanently to the JPEG file. I am of the belief that you should set your camera to the best possible settings for the job, even if you decide to change them later (when using RAW).
============================================== Darrell Young (DigitalDarrell) www.pictureandpen.com "Better too many words than not enough understanding." ==============================================