Doc: Usage added @knownissue for LaTeX (issue 5492075)

[dak]

http://codereview.appspot.com/5492075/diff/1/Documentation/usage/lilypond-book.itely
File Documentation/usage/lilypond-book.itely (right):

http://codereview.appspot.com/5492075/diff/1/Documentation/usage/lilypond-book.itely#newcode915
Documentation/usage/lilypond-book.itely:915: @dots{}
@address@hidden@}} environment.  Use @code{\newcommand}
Sure \paper does not work?  I'd rather suspect that the working paper
block variables are merely restricted to that set operating within the
image included from Lilypond, while the outside and embedding would be
under control of LaTeX instead.

http://codereview.appspot.com/5492075/