Summary of important user-visible changes for pkg-octave-doc 0.8.5:
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 ** `package_texi2cache` no longer fails with `class not found` on a class
    whose superclass lives in another directory of the package.  The package
    tree is on the load path for the whole run, and the path is left as it
    was.

 ** A `doc-cache` no longer spaces punctuation off marked-up text: `alpha ,`
    and `( x )` read `alpha,` and `(x)` again.  Rebuild the caches to pick it
    up.

 ** The signature lines and the class title of a help page are valid HTML.
    Pages look the same; in the Qt help the signatures are larger, in regular
    weight, with the name in bold.

 ** A help page whose text holds a table no longer repeats the "Source Code"
    link after every table; it is written once, at the end.
