Setting Page Size and displaying result correctly

[Christopher Dimech]

Dear Compeers,

I have recently mentioned allowing multiline titles in structured commands
(e.g. @chapter, @section, @unnumberedsec)

Another Texinfo aspect to mention is properly setting the page size using 
@pagesizes.

Firstly, if one uses a smaller pagesize, the resulting pdf simply cuts the
page out to the required size. This means that the part of the text, figures,
etc ... that is outside the area are cut out.

Have used @pagesizes 250mm,176mm I have also noticed that the result is almost
correct, showing a pagesize of 250mm,182mm. Perhaps it is also something to look
at.

Making @pagesizes work would be extremely beneficial for users.

Regards
Christopher