PDF vs HTML links

[Nick Payne]

There are links that work in the PDF version of the documentation but 
not in the HTML version. For example, in the latest 2.13.12 PDF 
documentation, on p.224 of the Notation Reference (selected fingering 
snippets), there are links at the bottom of the page to the StringNumber 
and Fingering sections of the Internals Reference that work correctly so 
long as I have the Internals PDF in the same directory.

However, those same links in the online HTML documentation 
(http://lilypond.org/doc/v2.13/Documentation/notation/common-notation-for-fretted-strings) 
point to non-existent pages. I haven't downloaded the HTML doc to to see 
if behaviour is the same when installed locally.

Nick