[Cin] Revision Proxy section on Manual

[Igor BEGHETTO]

I read the proxy version by Phyllis (html) and Andrea (odt). Sorry for 
the extra work.
(and for my bad English,... thanks Phyllis for that; I think my English 
teacher would have rated my exercise 4/10).
:'-(

Yesterday I was working on the update version by Phyllis and Andrea 
using LibreOffice-Writer with its Record changes feature only to add a 
little thing. But I think it is better if I write here because I do not 
know how/where to insert it. It is about "You should always save your 
project with the Proxy disabled" and "A good idea to... README file" in 
the Using proxy subchapter.

I would like to write:
Some Projects may use different Proxy settings. If you load a project 
where the Proxy is set and disabled, it could use a different setting 
because you changed the Proxy settings in a project you were working on 
before.
If in that Project its proxy files were not deleted and you want to 
reuse them for save time, unfortunately they will be created again 
because the proxy settings has changed.

Thanks!

IgorBeg