bitops: doc: documented test_bit

Added doxygen comments to test_bit.

Signed-off-by: Michel Megens <dev@michelmegens.net>
types: doc: added the types header to doxygen.

Added include/etaos/types.h to the documentation system. All entities in
the header have also been documented.

Signed-off-by: Michel Megens <dev@michelmegens.net>
list: doc: documented the linked list API.

Added full doxygen documentation to the linked list API in
include/eatos/list.h.

Signed-off-by: Michel Megens <dev@michelmegens.net>