[D-I manual] some typos

[philippe.batailler@free.fr (Philippe Batailler)]

Hello,

French typography requires to put calls to footnote inside the last sentence.
I think it's the same in english.
If you agree, I can commit 3 changes in welcome/about-copyright.xml (2) 
and preparing/bios-setup/i386.xml (1).

Regards,


-- 
Philippe Batailler