[bug #44529] make doc function aware of package documentation files

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Follow-up Comment #10, bug #44529 (group octave):=0A=0AI have checked of th=
e original behavior in comment #0 is still present. And I=0Acould NOT repro=
duce this error message any more with Octave 11.3.0 under=0AWindows 10.=0A=
=0AAdditionally, help in the doc viewer seems to be implemented in serveral=
 OF=0Apackages already.=0A=0ASo yes, I would agree that this bug report can=
 be CLOSED now.=0A=0A=0A    _______________________________________________=
________=0A=0AReply to this item at:=0A=0A  <https://savannah.gnu.org/bugs/=
?44529>=0A=0A_______________________________________________=0ANachricht ge=
sendet =C3=BCber Savannah=0Ahttps://savannah.gnu.org/=0A
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