I figured it out. The ghelp links are entered as "xref" links in mallard, but
they should be "href" links:
this example: <link href="ghelp:software-center">Ubuntu Software Center
Manual</link> works.
** Changed in: ubuntu-docs (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/769027
Title:
ghelp links are no longer working in recent builds of the 11.04
documentation
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