change title of doc-tagged lsr-snippet 586

[Thomas Morley]

Hi,

in /Documentation/snippets we have markup-lines.ly coming from LSR.
http://lsr.di.unimi.it/LSR/Item?id=586

Although the code correctly uses \markuplist the description says:
"Text that can spread over pages is entered with the
<code>\markuplines</code> command."

I'd like to change the description and the somehow misleading title.

Any problem with our docs while changing the title in lsr?

Cheers,
  Harm