Doc: NR add \chord to examples in A2

Doc: NR add \chord to examples in A2

Issue 3755

Added new column to show a working example (also useful for Blind composers)
Minor layout quibbles with @multitable means using the @* (forced break)
for TexInfo commands - not strictly LP doc policy - to enhance clarity

Reduced the line-width slightly of the @lilypond examples simply to
help accommodate the extra column

[Trevor Daniels, 2013-12-28 08:39:28]

LGTM, but why not use @* to split the lines
for the first item in every line?  This
column could then be made a little narrower.

Trevor

[fedelogy, 2013-12-28 16:58:11]

If you keep .3 for the second column width, you avoid the stretching of the text
inside the column.
I would reduce the narrowest columns, something like:

-@multitable @columnfractions .2 .3 .2 .2
+@multitable @columnfractions .15 .3 .15 .15 .2

[pkx166h, 2013-12-29 05:16:50]

Using Trevor and Federico's suggestions to come up with better looking columns

[pkx166h, 2014-01-04 12:32:12]

author	James Lowe <pkx166h@gmail.com>	
	Fri, 27 Dec 2013 23:50:57 +0000 (23:50 +0000)
committer	James Lowe <pkx166h@gmail.com>	
	Sat, 4 Jan 2014 12:22:59 +0000 (12:22 +0000)
commit	2fbb7b60302656648646817959da1f2c4f5f74de