Doc: NR 3.2.1: clarify titles and \header blocks (2652) (issue 6474066)

[graham]

LGTM


http://codereview.appspot.com/6474066/diff/1/Documentation/notation/input.itely
File Documentation/notation/input.itely (right):

http://codereview.appspot.com/6474066/diff/1/Documentation/notation/input.itely#newcode368
Documentation/notation/input.itely:368: A @code{\header} block.  This
sets the global, i.e. book, header
could this be (i.e. book) instead?  I think this is a parenthetical
remark rather than a commatical or comedical one.

http://codereview.appspot.com/6474066/diff/1/Documentation/notation/input.itely#newcode554
Documentation/notation/input.itely:554: @ref{Default layout of bookpart
and score titles}).  Both Bookpart
why the capitals for Bookpart, Score, and Titling ?  If you want to
distinguish them, wouldn't @code{bookpart} make more sense?

http://codereview.appspot.com/6474066/