stapprobes and stapfuncs man pages were removed in systemtap 1.8 but are still referqnced from other man pages, the tutorial, tapset reference guide and beginners guide. There is still a stapprobes.3stap file in the repository but we don't install it in the package. These old man pages should really be installed, if only to point out where the new information/overviews of probes and functions are. Old users (like me) don't know :)
Sorry, stapprobes seems to still be there, but stapfuncs is definitely gone.
BTW. The real thing I was looking for was the manual page for printf, which happens to be described in the main stap.1 man page.
commit 046da1d