This change makes the docs repo always use the official abbreviation (CC BY 3.0)
for its license. Previously, it would sometimes use “CC-BY 3.0” or
“CC-BY-3.0”. This change also make the docs repo always point to the
official Commons deed [1] for more information about CC BY 3.0.
Previously, it would sometimes link to an unofficial source [2].
[1]: <https://creativecommons.org/licenses/by/3.0/>
[2]: <https://tldrlegal.com/license/creative-commons-attribution-(cc)>
Each contributor is now listed on a separate line in the github mardown rendering.
And it is more consistent with the authors file in the main engine repo.