Snippet "Adjusting lyrics vertical spacing" fails

[Volker Paul]

Hi,

trying that snippet:
http://lilypond.org/doc/v2.14/Documentation/snippets/text#adjusting-lyrics-
vertical-spacing
I got the 
warning: cannot find property type-check for `nonstaff-relatedstaff-spacing' 
(backend-type?).  perhaps a typing error?
and as expected, it didn't work, i.e. the spacing was the same.

My version is 2.12.3, and I tried to find out if nonstaff-relatedstaff-spacing
has been added in a later version. So I went to the page:
http://lilypond.org/doc/v2.15/Documentation/changes/index.html
and clicked on
http://lilypond.org/doc/v2.14/Documentation/topdocs/NEWS.html
but that page isn't there:

Not Found
The requested URL /doc/v2.14/Documentation/topdocs/NEWS.html was not found on 
this server.
Apache/1.3.34 Server at lilypond.org Port 80

Is my version 2.12.3, too old for nonstaff-relatedstaff-spacing?

Regards,

Volker