Error (?..) in documentation -- NR, music functions

[Dmytro O. Redchuk]

NR, 6.1.1 : probably, replace every "arg" with "var" (or otherwise):

------------------------------------------------------------------
6.1.1 Overview of music functions

Making a function which substitutes a variable into LilyPond code is
easy. The general form of these functions is

function =
#(define-music-function (parser location var1 var2... )
                        (var1-type? var2-type?...)
  #{
    ...music...
  #})

where

argi    ith variable
argi-type?      type of variable
...music...     normal LilyPond input, using variables as #$var1.
------------------------------------------------------------------

-- 
Dmytro O. Redchuk