Correct rbd::Block doxygen
Correct rbd::Block doxygen

gergondet/RBDyn,gergondet/RBDyn,gergondet/RBDyn,jrl-umi3218/RBDyn,jrl-umi3218/RBDyn,gergondet/RBDyn,jrl-umi3218/RBDyn,gergondet/RBDyn,jrl-umi3218/RBDyn