Docs: example for line-break-permission and page-break-permission

[Paul Morris]

The example given here: 
http://lilypond.org/doc/v2.18/Documentation/notation/explicit-breaks

is not so good since the output is actually the same when you comment out the 
commands that it is intended to illustrate: 

% \override NonMusicalPaperColumn.line-break-permission = ##f 
% \override NonMusicalPaperColumn.page-break-permission = ##f 

(It is a good demonstration of ragged-bottom and ragged-right, however.)  To 
improve it the number of measures on some of the lines and the number of lines 
per page would need to be increased so that they are large enough to trigger an 
automatic line break or page break if these commands were not present.   

Below is a suggested revision that does a better job of illustrating the 
effects of those two commands.   

Thanks,
-Paul

% 
\version "2.18.0"
\paper { 
  indent = #0 
  ragged-right = ##t 
  ragged-bottom = ##t 
} 

music = \relative c'' { c8 c c c } 

\score { 
  \new Staff { 
    \repeat unfold 2 { \music } \break 
    \repeat unfold 2 { \music } \break 
    \repeat unfold 4 { \music } \break 
    \repeat unfold 6 { \music } \break 
    \repeat unfold 8 { \music } \break 
    \repeat unfold 10 { \music } \break 
    \repeat unfold 12 { \music } \break 
    \repeat unfold 14 { \music } \break 
    \repeat unfold 12 { \music } \break 
    \repeat unfold 10 { \music } \break 
    \repeat unfold 8 { \music } \break 
    \repeat unfold 6 { \music } \break 
    \repeat unfold 4 { \music } \break 
    \repeat unfold 2 { \music } \break 
    \repeat unfold 2 { \music } \pageBreak 
    \repeat unfold 2 { \music } 
  } 
  \layout { 
    \context { 
      \Score 
      \override NonMusicalPaperColumn.line-break-permission = ##f 
      \override NonMusicalPaperColumn.page-break-permission = ##f 
    } 
  } 
}