Merge "Clarified recommended use cases for NDK. Added - "game engines"...

Merge "Clarified recommended use cases for NDK. Added - "game engines" officially supported use case for NDK Removed - "self-contained" ambiguous in general and confusing to someone who is trying to do game development in C++ Removed - "that don't allocate a lot of memory" game engines do allocate a lot of memory." into klp-docs