Doc: add markup objects overview
Someone on -user has made me realize that there was
room in the current NR for a (non-exhaustive) list of
the different places where \markup may be used:
https://lists.gnu.org/archive/html/lilypond-user/2019-01/msg00425.html
Aaron Hill has provided a nice example, which I elaborated
upon as http://lsr.di.unimi.it/LSR/Item?id=1084
and then Trevor D. convinced me that it could
find its way into the NR itself. So, there.
Diff:
Passes make, make check and a full make doc.
Patch on countdown for Jan 26th - but there are some minor nits from Werner that need to be acknowledged in Rietveld.
Passes make, make check and a full make doc
Patch on countdown for Feb 1st
Patch counted down - please push.
Pushed as https://git.savannah.gnu.org/cgit/lilypond.git/commit/?h=staging&id=e4996ee891128a07256e95f3c8321134eb7dd499
Thanks!