Patch for guide file "ch_basics.xml"

[Cristian Marchi]

I attach the diff for the "ch_basics.xml" guide file. I've reviewed the 
entire document and I've corrected some typo. The majority of works went 
in updating the "Preferences" chapter.
I've also added, where applicable, the structure for menu, submenu and 
menuitem (e.g. 
<menuchoice><guimenu>File</guimenu><guisubmenu>Import...</guisubmenu><guimenuitem>Import 
QIF</guimenuitem></menuchoice>).

My English is not perfect so it's (very) possible that I made some mistake.

If I don't get any comments, in the week-end I'll commit the changes.

Thanks
Cristian
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