[authors] Creating formulas - OpenOffice.org Wiki

[Regina Henschel]

Hello all,

I have made a lot of changes to 
http://wiki.services.openoffice.org/wiki/Documentation/OOo3_User_Guides/Calc_Guide/Creating_formulas#Reference_operators

It should be right now in content. But someone should review it and 
remove my comments then.

I'm no native English speaker and my English is not very good. Therefore 
the whole part needs a linguistic review. In addition I think, that some 
pictures would be nice, but that excesses my small free time.

Kind regards
Regina