[luatex] unsetting attributes in the manual

[Manuel Pégourié-Gonnard]

Hi,

The manual for version 0.65.0 says (page 16 = pdf page 20)

> \setbox2=\hbox attr1=12 attr2=-1{Hello}
> 
> This will set the attribute list of box 2 to 1 = 12, and the attributes of 
> box 0 will be 2 = 5. As you can see, assigning a negative value causes an 
> attribute to be ignored.

Unless I missed something, -1 should be changed to -"7FFFFFFF and the following
sentence adapted accordingly due to changes in luatex 0.37.

Manuel.