There are a few missing #'s within URI's in the example. I've put the relevant places inside a {} Intra-document references To refer to figure 3 in chapter 1, type { <uri link="doc_chap1_fig3"> } figure 1.3</uri>. Or, to refer to code listing 2 in chapter 2, type { <uri link="doc_chap2_pre2"> } code listing 2.2</uri>. We'll be adding other auto-link abilities (such as table support) soon. They should be <uri link="#doc_chap1_fig3"> and <uri link="#doc_chap2_pre2">.
Putting up a patch on this as well, for what its worth.
Created attachment 58295 [details, diff] Dumb patch Fixes the 2 instances :)
Dumb patch slightly edited and committed.
You win some, you lose some. :p