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freecad: link doc path
`freecad` expects doc to exist in `$out/share/doc`, or else the `About FreeCAD` menu complains: ``` 10:49:34 QTextBrowser: No document for file:////nix/store/fspwhlqvj876sw05292780clfsphx1zj-freecad-1.0.0/share/doc/FreeCAD//ThirdPartyLibraries.html ```