Uses of @ref for xrefs in our docs

[Reinhold Kainhofer]

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There are currently four spots, where an explicit @ref is used for a 
cross-reference to a different manual:

changing-defaults.itely:@ref{Top,Internals Reference,,lilypond-internals}.
introduction.itely:@ref{Top,Music glossary,,music-glossary}:
introduction.itely:@ref{Top,LilyPond Snippet List,,lilypond-snippets}: this 
shows a
introduction.itely:@ref{Top,Internals Reference,,lilypond-internals}: this is 
a set

While this seems to work at first glance, it breaks with bigpage. Can anyone 
fix those four references (and of course the corresponding translations!) to 
use @rglos, @rlsra and @rinternals.

Cheers,
Reinhold

- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: address@hidden, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
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