[CMake] Lower the barrier of entry to the wiki

[Stephen Kelly]

Gonzalo BG wrote:

> This is what happened:

> - For making an account I had to fill up a 50 words bio .

Years ago this prevented me from creating a wiki account. I put 'this page 
intentionally left blank' in this field because I thought I shouldn't have 
to fill a bio to edit a wiki (like you presumably). My account request was 
rejected, so I used the kde wiki instead :).

 https://community.kde.org/Frameworks/Epics/CMake_target_usage_requirements

> I think that having a wiki with such a high barrier of entry is pointless.
> By the time my account gets reviewed it is going to be a miracle if I
> actually get to contribute those recipes.

What do you want to edit? Would it be better to improve the CMake 
documentation instead?

 http://www.cmake.org/cmake/help/v3.1/

Thanks,

Steve.