Re: Doc: mention empty chords; avoid using zero-duration spacers in examples (issue 6197068)

[tdanielsmusic]

LGTM


http://codereview.appspot.com/6197068/diff/1/Documentation/notation/simultaneous.itely
File Documentation/notation/simultaneous.itely (right):

http://codereview.appspot.com/6197068/diff/1/Documentation/notation/simultaneous.itely#newcode89
Documentation/notation/simultaneous.itely:89: r4 e8( g <>) ^"sul D" \f
\> \repeat unfold 8 { c-. } r2\!
Interestingly, s1*0 does not work in this situation to attach the
annotations to the first note in the repeated section, but <> is fine.
Unfortunately, <> is of no help for attaching the \! to the final note
of the repeated section.

http://codereview.appspot.com/6197068/