changing-defaults.itely: correct misstatement about variables for context mods (issue 5306076)

[pkx166h]

Some Doc policy nit-picks


http://codereview.appspot.com/5306076/diff/1/Documentation/notation/changing-defaults.itely
File Documentation/notation/changing-defaults.itely (right):

http://codereview.appspot.com/5306076/diff/1/Documentation/notation/changing-defaults.itely#newcode727
Documentation/notation/changing-defaults.itely:727: You may collect
context changes in a variable and apply them to a
Context changes in a variable can be a collected and applied to a ...

[don't refer to the reader (i.e. third person)]

http://codereview.appspot.com/5306076/diff/1/Documentation/notation/changing-defaults.itely#newcode742
Documentation/notation/changing-defaults.itely:742: melody = \relative
c'' { a4 a a a  a a a a }
bar checks please.

Also it might look more consistent  as

melody = \relative c'' {
  a4 a a a |
  a4 a a a |
}

http://codereview.appspot.com/5306076/diff/1/Documentation/notation/changing-defaults.itely#newcode753
Documentation/notation/changing-defaults.itely:753: >>
Indent incorrect for '>>'

http://codereview.appspot.com/5306076/