Docs: Parenthesized tempo marks

[Reinhold Kainhofer]

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I just realized that with the new \tempo function it's very easy to generate 
parenthesized tempo marks: Simply use an empty text, i.e.
   \tempo "" 4=60
will produce
  (quarter = 60)

That might be mentioned in the docs, too, since it's quite common to 
parenthesize metronome marks...

Cheers,
Reinhold

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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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