Update documentation URL to point to github hosted docs.
Update documentation URL to point to github hosted docs.

ThatGuyCND/D8-Twig-Prototype,ThatGuyCND/D8-Twig-Prototype,prontotype/prontotype-LEGACY,ThatGuyCND/D8-Twig-Prototype,prontotype/core-LEGACY,prontotype/prontotype-LEGACY,prontotype/core-LEGACY