Feedback on the new docs site

Hi. The example code on the Programming Quickstart page doesn’t compile.

First few errors:


E0070    incomplete type is not allowed    ...FloatingActor.cpp    6    
E0020    identifier "PrimaryActorTick" is undefined    ...FloatingActor.cpp    9    
E0020    identifier "CreateDefaultSubobject" is undefined    ...FloatingActor.cpp    11    
E0254    type name is not allowed    ...FloatingActor.cpp    11
...