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

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Update of bug #44529 (group octave):=0A=0A                  Status:        =
       Confirmed =3D> Fixed=0A             Open/Closed:                    =
Open =3D> Closed=0A=0A    _________________________________________________=
______=0A=0AFollow-up Comment #11:=0A=0AThank you Hartmut.=0A=0AClosing thi=
s very old bug report then with Status =3D "Fixed".=0A=0A=0A    ___________=
____________________________________________=0A=0AReply to this item at:=0A=
=0A  <https://savannah.gnu.org/bugs/?44529>=0A=0A__________________________=
_____________________=0AMessage sent via Savannah=0Ahttps://savannah.gnu.or=
g/=0A
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