(doc help) internal lilypond file locations on non-OSX

[Graham Percival]

Quote from upcoming docs; please fill in the ####.

Cheers,
- Graham

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Some default settings (such as the definitions for
@code{\header{}s) are stored as @code{.ly} files.  Other
settings (such as the definitions of markup commands) are
stored as @code{.scm} (Scheme) files.  Further explanation is
outside the scope of this manual; users should be warned that
a substantial amount of technical knowledge or time is required
to understand these files.

@itemize bullet

@item Linux: @file{/usr/ ... }  #####

@item OSX:
@address@hidden@}/LilyPond.app/Contents/Resources/share/ 
lilypond/current/}.
To access this, either @code{cd} into this directory from
the Terminal, or control-click on the LilyPond application
and select "Show Package Contents".

@item Windows:  #####

@end itemize