Doc: Appendix - Articulations and Ornamentation - part 3

Issue 1189

Create Texifo @multitable entries for the
List of Articulations appendix.

As there are a lot of separate scripts being
documented this Issue is going to be split
into multiple, smaller, parts to aid in the
review process. Part 2 was commit 4d6f2a27cc

This is part 3 and while not strictly
'Articulations and ornamentations' covers
the percussion scripts.

I have also set the @code{} script examples into
the same column as the @lilypond examples; saving
a significant amount of wasted page space. I have
removed unnecessary lilypond-book variables making
the texinfo code less noisy.