Changes in the CONTRIBUTING.md file

[Nikhil Sharma]

I was going through the CONTRIBUTING.md file and found "generated" spelled as "genenrated ".

Also, under Documenting, "The Codename One developer guide is genenrated from the wiki pages of this project you can just edit the wiki directly and your changes propogate into the developers guide."

could be reframed as,

"The Codename One developer guide is genenrated from the wiki pages of this project. You can just edit the wiki directly, and your changes will reflect in the developers guide." which I think looks a little better.

[Yash Pimple]

I would like to work on this issue.

[FercueNat]

Hello! I would like to help in this one :)

[Shai Almog]

Fixed by #3639