[kde-doc-english] Typo in kexi handbook

[koxinga]

Hello,

I hope it is the right place to send this.

Here is a small patch correcting some typos in the kexi handbook that I 
caught while I was translating it into french.

In this handbook, the few chapter references are written directly in the 
docbook file and are not always coherent (there is a "chapter 5.2" in 
designingforms.docbook, while the chapter mentioned is in fact the 3.2). 
Is there a better way to make references to other chapters ?

koxinga